Malicious PDF — malware analysis report

Static analysis result for SHA-256 9211a98ef371a29f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 03:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 285369e407adc4bf95915049938b46d2 SHA-1: b24cb69db30f0d516cd30204eca9de5fd4d8be47 SHA-256: 9211a98ef371a29f853568d381b75ec48b331e3f6d10ff9bc83c3d7077116b96
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external URLs disguised as search results for "Budidaya bayam cabut pdf". The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent, likely for SEO spam or to redirect users to phishing sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/award?keyword=budidaya+bayam+cabut+pdf PDF link annotation
    • https://linasiwafeki.weebly.com/uploads/1/3/1/3/131380288/f8a757.pdfIn PDF document text
    • http://kotebebe.iblogger.org/anet_a8_titan_extruder_upgrade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_601e783a67feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6010e3cd46f2b.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/459156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_6011cdf3d31fb.pdfIn PDF document text
    • http://toximakuvox.iblogger.org/active_and_passive_voice_simple_present_tense_worksheets.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/padejixemidujafitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_6056d62b08641.pdfIn PDF document text
    • https://nanagupuwaxa.weebly.com/uploads/1/3/5/3/135322083/80d6157afae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/vanarux.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/45977052772.pdfIn PDF document text
    • http://xedonufil.rf.gd/58346294237.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_f25f36d2e38449dbbd7d8fcd5e35457c.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_6d5c18764cc8480e9c962abe0fd5c80c.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_8593ae75626245c09d9b942160b16306.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_82635ddd32c3400ab00e5e140f42ffa1.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_a40fac0641674fc198b8c7652cbf013e.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_7731113253c74daa9d65811c1ea9fc3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/pefobisagunasilege.pdfIn PDF document text
    • http://tarefipiv.rf.gd/gusigo.pdfIn PDF document text
    • http://tobevilojojarog.rf.gd/guwezekiwolurefevumetinu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5288 bytes
SHA-256: 71a5629f8dd6b9592f125969f788be310422583148f5110eb77539e56eaa4f59
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10124 bytes
SHA-256: 42db9b5ace47bc9c50456699bbbd17e1e8733384b482f0a208ded5260bc5d379