Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55bce16990253ed…

MALICIOUS

PDF

80.0 KB Created: 2021-06-04 22:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66fcab17e93244c2f16af25945bff587 SHA-1: 103dcfe04f8974ba339728691c29a48e53e37989 SHA-256: e55bce16990253ed21109bb4a118b0dfc863b811d3f02c44180f957890546c62
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://crewmak.ru/pbw?utm_term=gateway+a2+workbook+answers+unit+1 PDF link annotation
    • https://nemaxalifaxibox.weebly.com/uploads/1/3/4/6/134627725/080d2a8.pdfIn PDF document text
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/deb1a25aeb.pdfIn PDF document text
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/1498913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_60307de7115a2.pdfIn PDF document text
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/dijegiberonem.pdfIn PDF document text
    • https://novizatedorik.weebly.com/uploads/1/3/6/0/136095988/morewisuzasuvi_polit_sujadox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_603be0c92c745.pdfIn PDF document text
    • https://finonofegikagaf.weebly.com/uploads/1/3/4/0/134041572/toveka.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/8752748.pdfIn PDF document text
    • https://kalodobig.weebly.com/uploads/1/3/4/4/134432105/381895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_602e50063ca73.pdfIn PDF document text
    • https://doluxofaxomivu.weebly.com/uploads/1/3/4/7/134715621/2380532.pdfIn PDF document text
    • https://suzagadagaxu.weebly.com/uploads/1/3/0/7/130775939/lujopokunoru.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/jubomavapirudoju.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/07e2ee97-1854-4b40-8db2-39b0badf6393/conair_hair_clipper_replacement_blades.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/clone_android_phone_hacking_tricks.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144422973/cuales_son_los_cereales_mas_saludables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0b3a94-8d86-49bb-b89a-7fcfa1e7296a/17621253951.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/genel_muhasebe_1_anadolu_niversitesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5ef0a4-6fcb-464a-a1d3-36f7f3e6eebd/politics_as_a_vocation.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/can_power_of_attorney_transfer_car_title.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426375/pdf_calendario_2020_mexico_para_imprimir_gratis_chile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5260 bytes
SHA-256: 9e3242682551c65a5907608ecf49b299db463534be3c730fe4a8e270baf10524
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 11392 bytes
SHA-256: c0adaf32170a3021b8e3c667b0c524c600c6d53f7db9ad63414cd0018753a502
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16076 bytes
SHA-256: d286e8b4d1cdafc5f769987bdccf7a6368ad55d0d3b8f98fd56bc2ae223999f8