Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb6479d3c8166ab…

MALICIOUS

PDF

81.3 KB Created: 2021-02-15 09:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 442f11985437f44b4d67913e101fe8ff SHA-1: 5c6ebd6df17ace6676bc6289761689a0e895c84d SHA-256: ccb6479d3c8166ab957af27262e83eb6014665a733ab03ff9dff080483a8cf9a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, a common tactic for SEO farms or phishing campaigns. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

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://bologen.ru/strik?utm_term=drift+ride+on+car PDF link annotation
    • https://cdn.sqhk.co/figakeves/ighfghK/move_photos_to_sd_card_samsung_j5.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/zobijaxuripu.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/1996244.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/kemiluvewuboku.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hJgeYgj/93702215749.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/dudoda.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/6540429.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/62149cff.pdfIn PDF document text
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/rinanokugudonawij.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/fjhiekb/xezixor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/wekevutodipigefa.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/black_amoled_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/mailing_labels_from_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/ethnographic_method.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/dynasty_warriors_unleashed_beginners_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 4592 bytes
SHA-256: c8b2af5d97c52edeaf260e224d294a5523e03da165e2c00dd60990b53e775262
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10528 bytes
SHA-256: abdb7cd39bf52765070f06bc1061b32f9c31a64f470de878c2ca23ffc8d74ae3
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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