Malicious PDF — malware analysis report

Static analysis result for SHA-256 862bca97cd32a1c6…

MALICIOUS

PDF

81.0 KB Created: 2021-01-12 15:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 48e4efac75e7bea22068ddaf02a0b38b SHA-1: 46bf861ffbd29d297253ba10a3c8657f44494449 SHA-256: 862bca97cd32a1c65938e2e71f5e5996aafdc1799bf56ebe82feafb99373fb85
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=how+to+make+a+poppet+doll PDF link annotation
    • https://cdn.sqhk.co/duvapegoleva/esihyif/54202315458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5fd3151d7a18c.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/vRgiheR/the_tiger_king_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/RP81coX/lazulegedokefufu.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/9Khigi1/5876590126.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/zixokojos_kozuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukut/counter_strike_1._6_steam_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/math_answers_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/xilexujeranar.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/765742603.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/xivilabibejeb.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_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 4948 bytes
SHA-256: c0b112e417898d09565e18570443ce7afc4e780ef3659e1df5562ed14e08934a
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10836 bytes
SHA-256: b0d32dda89abd84b3d3f49146387939350d1f422bc63b3e06b1ba84d71db154f