Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1a313be00720b3…

MALICIOUS

PDF

74.3 KB Created: 2021-06-13 14:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a0d37cd6ae954be0a6d258b02a23403f SHA-1: 50887e2c9bc92350a6d50b5df889acc7f11457bf SHA-256: 2d1a313be00720b3adcb8796bff953d9ad9aa7828cb8c9db6ad81521fdca04c3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The primary external URI, 'https://crewmak.ru/pbw?utm_term=animal+farm+pdf+chapter+6', indicates a lure related to 'Animal Farm' to entice clicks.

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=animal+farm+pdf+chapter+6 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4503387/normal_60b4e0378c4a1.pdfIn PDF document text
    • https://turetajonu.weebly.com/uploads/1/3/4/6/134629909/89f2143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_603c2613e3d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_6036343bd1c72.pdfIn PDF document text
    • https://xovaxavirot.weebly.com/uploads/1/3/4/8/134853903/foralomeliso.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/wabemume.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/4764318.pdfIn PDF document text
    • https://foxizogifo.weebly.com/uploads/1/3/4/6/134627616/jajitokoxojiwipilu.pdfIn PDF document text
    • https://rabitobepuxujit.weebly.com/uploads/1/3/4/0/134012490/5645748.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/5078087.pdfIn PDF document text
    • https://seruliwosudaz.weebly.com/uploads/1/3/4/4/134457931/d6dbd569.pdfIn PDF document text
    • https://zewugijisisu.weebly.com/uploads/1/3/4/8/134885238/demigopunid_majunebofoju_resubave.pdfIn PDF document text
    • https://xiliwawegumokap.weebly.com/uploads/1/3/4/0/134096460/67adf6.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/4655ead9c.pdfIn PDF document text
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/4311470.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/9766040.pdfIn PDF document text
    • https://fobimagav.weebly.com/uploads/1/3/4/2/134235660/nepoxonozizuwu.pdfIn PDF document text
    • https://sipusojatavajuw.weebly.com/uploads/1/3/4/6/134606658/641a9f410f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://febokipup.pbworks.com/w/file/fetch/144667494/13789994031.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144592719/36036324105.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/w/file/fetch/145229175/dotejemum.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144505089/can_you_disable_bixby_on_s8.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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5360 bytes
SHA-256: fb096c6a724536699135ad48068f4c88e640bab95964732a43cdbdd2a137b1b2
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 10836 bytes
SHA-256: c80d666bed1f83bf32348f63cab28494e49db3c78988bc7b455106033385ba1f