Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61243dd1416a408…

MALICIOUS

PDF

85.2 KB Created: 2021-06-12 17:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1086ee6c10d38423bbf766785f71446b SHA-1: 05518c654e0bd1b0880297065cc80de8a67fc2fb SHA-256: a61243dd1416a4082b8a3885162e888ed583754f283aefc57041a6a3ec64e466
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

This PDF file is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, and impersonates the Chase brand for credential phishing. It contains a link farm pointing to disposable hosting, with the primary redirector being https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/3461062.pdf, which likely leads to a phishing page. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/3461062.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/pbw?utm_term=rocket+soccer+derby+unblocked PDF link annotation
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/3461062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_606e41ce7488c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_605d908e70dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_6068db39e113a.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/6865818.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/garevugofejovukif.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/setulo.pdfIn PDF document text
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/redibenuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_602ab5f77c492.pdfIn PDF document text
    • https://fivaxozokudok.weebly.com/uploads/1/3/6/0/136049694/pubiziraraja_zifupure_lopuvuwafis_famavekimolib.pdfIn PDF document text
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/kamufiposikexi.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/7972649.pdfIn PDF document text
    • https://xogedanubukojoj.weebly.com/uploads/1/3/4/4/134491538/revalut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_601a68275faa7.pdfIn PDF document text
    • https://bovakexigi.weebly.com/uploads/1/3/5/3/135314068/3906959.pdfIn PDF document text
    • https://bunikesetula.weebly.com/uploads/1/3/0/7/130739723/kugator-nibusi-murafodiwakujol.pdfIn PDF document text
    • https://pagomowe.weebly.com/uploads/1/3/4/6/134608852/1044127.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/2792669.pdfIn PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/xeroloku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88855a2b-2f52-487f-8219-082f2a5d9167/robelaromenub.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144751920/56699458555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89be7769-94e3-42a9-9ce4-1f1e6ee79604/71799605163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affbfbd9-8af9-4b0c-9020-f3519d463814/how_do_you_know_if_an_acid_or_base_is_strong_or_weak.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144511392/wipusomaxube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef02c89b-202f-4c82-9f69-2b2c8023a3c0/41667635946.pdfIn PDF document text
    • http://nudenuxote.pbworks.com/f/manual_car_parking_mod_apk_android_1.pdfIn PDF document text
    • http://wodupabizel.pbworks.com/w/file/fetch/144942180/54945695554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41fe881-15a5-4827-87f3-058756a5c545/apowermirror_pc_full_crack_2019.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 5036 bytes
SHA-256: 3ab5113d85f274c0f298f20c1d2292a65ddda24d6385c647909daf6fabfa2e0c
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 2528 bytes
SHA-256: b7468146875351edd2161ec593efc9b8e1e7a6e7196052a3b2f5aa066a657780
font_02_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10696 bytes
SHA-256: 534054e4d5a0c2505c1e4014e1394ad99b3263c0db7c20c4ea1f5d2f208de091
font_03_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16392 bytes
SHA-256: 954f30c1cce2e3a00f07cb0ababb04bf86a3a3c34ed8da2fc782bdc014231390

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