Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926204ba46515ab…

MALICIOUS

PDF

75.1 KB Created: 2021-06-14 08:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a50233b3f5e6f2240fa66ba00960d87a SHA-1: 0b9de7fc03f400d17cbfba71cd256a54c1cccb36 SHA-256: 1926204ba46515ab6fe739501aa4396dd094ce45d1b05036ff3c04ed90cfd24b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several heuristics, including ClamAV and an ML classifier, flagged this PDF as malicious, specifically noting phishing and trojan characteristics. The embedded URLs likely lead to malicious sites designed to phish credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/pbw?utm_term=the+other+side+of+the+couch+pdf PDF link annotation
    • https://rifemirumes.weebly.com/uploads/1/3/4/4/134490905/tevazofutusomok.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/jezoxu_bisorokuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_6046986031c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_600c53405bb77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_603fd1f042c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_60354e9812e9c.pdfIn PDF document text
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/5073380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_5fcaba7e5dfd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_601e74b9e6319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ff2d2013d558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489407/normal_5ffcf6b94d3a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_5fdb8882e0442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobapotowi.pbworks.com/f/fiwabigitixudop.pdfIn PDF document text
    • http://funesut.pbworks.com/f/std_10_maths_textbook.pdfIn PDF document text
    • http://gaguseka.pbworks.com/w/file/fetch/144606966/marshalls_return_policy_covid-19.pdfIn PDF document text
    • http://jakomija.pbworks.com/w/file/fetch/144725955/fejutulen.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144483285/putuxo.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144426759/todipixawonojewezizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c63270e-28c3-4e99-8bb1-d994f9fa398a/losidef.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/22214673288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d611bf7-b972-495d-b70a-457bc8582ea6/30032992506.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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 4948 bytes
SHA-256: 6b9fc83308d5444915dba0adedad6f284bcdcb426e744cf1e52d3d8121472a80
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 11272 bytes
SHA-256: 4375b49babd82953d102327ee09d7dfd56a223c62d8f7133ee4662f142fcd459

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