Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c32138b04398c7…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 10:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 69ae4c94c13006efbdfc62a08892e756 SHA-1: e4bb48b947b5478a16b907d446e271b69f6b0cc1 SHA-256: 83c32138b04398c7ce9bf930c014f1081c28266f83a44c5351a1f904d62d0a0d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'laborke.ru', which is flagged as a suspicious URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm for SEO manipulation or phishing. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://laborke.ru/pbw?utm_term=physical+and+chemical+properties+and+changes+worksheet+2+answer+key PDF link annotation
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/4f68d6adce83c8.pdfIn PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/ab8e4a78478607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371553/normal_5ff683645fe9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_6000f2b124920.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/7b6d4.pdfIn PDF document text
    • https://napakako.weebly.com/uploads/1/3/0/9/130968915/1199340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_6063c7e54c072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_603decb2793d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5ffcd821b7708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_60662791a89cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_6030f6718ec7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5ffbe15e78c86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ad8c22-ceac-43fa-bfa6-aab08bea74ed/punezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff942a33-b597-4b72-ac82-1cdccd8eee32/95007868263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4538feb-c683-4766-b69e-e75a746cd230/samsung_mu7000_55_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55199211-0120-4722-99c9-b505920a6c0d/latest_highway_capacity_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae6e7c2-deef-4f5c-b0cd-9be497f86553/13540253291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561343e3-39d3-4eac-93fa-221bf5720667/jedufexejexep.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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5880 bytes
SHA-256: 0ccab5a48ee8f7ed14c2bb4e130ca7f9d57151b7294899902a31ca6e4477f5f9
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10896 bytes
SHA-256: 383132bf98da6207ec80cdcb1b43f2335eba3f94f40ede6d14448b6c682211cc

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