Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90bcf12d00888e4…

MALICIOUS

PDF

114.8 KB Created: 2021-06-06 14:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26d3e7626d5270169ef4ce0f80ee0f7b SHA-1: 33dd2de767637827b1cd841dc6539800a76f8d49 SHA-256: f90bcf12d00888e4bc603cc16992ae0380b1638b9678df3c4fa8ea4a92fce11a
126 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('coretry.ru') that is likely part of a phishing or malware distribution scheme. The document's structure and the presence of many links suggest it functions as a link farm to distribute malicious content, masquerading as a helpful guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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 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://coretry.ru/pbw?utm_term=how+to+register+marriage+certificate+online PDF link annotation
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/jevebiwaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fddf4cad0402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_600e4d21c141d.pdfIn PDF document text
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/7588861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6023099427ad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fed532f7deb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_5fe80ec954833.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/7370361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_604572bc080c2.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/9749c1763c82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_5fd7f7e61f72c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_605452e4e09c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_6023c9af7f3d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144530157/jzyk_angielski_dla_ucznia_gramatyka.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144523170/xitafotabigegedok.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413382/arabic_calligraphy_font_generator_free.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/86382512282.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144618501/57901105130.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/namal_novel_by_nimra_ahmed.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/gelawuzudof.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144540051/wivenasati.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144580458/xedividolobezenebelipa.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/what_are_the_types_of_electronic_components.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144462486/intersecting_chord_theorem_corbettmaths.pdfIn PDF document text
    • http://depowota.pbworks.com/f/52226432000.pdfIn PDF document text
    • http://suzojadek.pbworks.com/f/convertir_grados_centesimales_a_sexagesimales_ejercicios_resueltos.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_off000182af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AF 5252 bytes
SHA-256: cf0e3269c1c06d944a22bdc271bb0136ab72279760cc39d9a986c2dc30484d31
font_01_sfnt_off0001948b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948B 11336 bytes
SHA-256: 385e4767c71ebeedc9e90ddb66917d0723148c94e852ec9cd02b2f9ac78f5b82