Malicious PDF — malware analysis report

Static analysis result for SHA-256 111ec1b7b92caa95…

MALICIOUS

PDF

77.9 KB Created: 2021-06-15 12:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92a6c7d8b2cd8b59a2bd4324f3c771a9 SHA-1: c691e2504f54f8874402b1e86741e05e120fd676 SHA-256: 111ec1b7b92caa95845b67f3ebb6323905072d7376a7f78d40fb99c386d1e4ff
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 numerous external links, identified as a link farm, with one prominent URL pointing to krisoc.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

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://krisoc.ru/pbw?utm_term=sev+star+wars+republic+commando PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468255/normal_6007d230866e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_606b7899c8992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_60bcfe73004e4.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/wepuxirem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_6039cac0bb851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_6024bab67924e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_60c5de17dd66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_60c5eb882458a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425501/normal_60b52a70739b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ff0e2b060e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_602e23a533074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5ff3d220e3421.pdfIn PDF document text
    • https://lujogome.weebly.com/uploads/1/3/4/6/134617312/6691547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5ff2a93ad0874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_6029c5b87751d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_60523595829e5.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/ranasib-kelabigowij-duginotimuvod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475391/normal_5fcd6f1b88024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pobepamuti.pbworks.com/w/file/fetch/145069995/8790078968.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/w/file/fetch/145020372/rumivigezixowuzimemaze.pdfIn PDF document text
    • http://boxedaw.pbworks.com/w/file/fetch/145237890/lagefivuxeb.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5612 bytes
SHA-256: a257cebf22ac5cba1283698463e83bd952a3bae38be94e7ac609ea3d29804f98
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 10424 bytes
SHA-256: 0378d795d19b7ee7d7748545147a32df49f76088720175e6c09145f2fca3adba

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