Malicious PDF — malware analysis report

Static analysis result for SHA-256 da07bad15bcdf736…

MALICIOUS

PDF

71.4 KB Created: 2021-03-03 10:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e3291d6c500710fca2e3a898fa40888f SHA-1: 6aa22dd7f747b66ece074e9f98733240e005333b SHA-256: da07bad15bcdf736d3b8060dfe3a22829304ad23726ef0c08dcb62ce7b5730a1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL suggesting a lure related to 'Diablo 3 builds monk'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=diablo+3+builds+monk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170aa454426.pdfIn PDF document text
    • https://cdn.sqhk.co/vazedibimi/eidhdYl/wurogikazelevu.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/s0g0hiB/enerpac_p_801_pump.pdfIn PDF document text
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/837568.pdfIn PDF document text
    • https://cdn.sqhk.co/volotedi/ggeCifG/wokukepo.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/6hfeidi/sezakowetoba.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ijha1DA/vegamorupukoxoxazofegogew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5fefa13487b07.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/Tkjg5gg/80007470708.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/djgTVic/31946862107.pdfIn PDF document text
    • https://dudosixe.weebly.com/uploads/1/3/4/3/134323580/zimofuwesi.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/fajeloninesitel/siniruloperobidogol.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/how_to_win_the_4_digit_lottery.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 5244 bytes
SHA-256: ade8d2528b7339d3549a77ee7b9e51a5cdadaee110647efa4a0d5792af3e5e22
font_01_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 10616 bytes
SHA-256: 1c4d1c771d30336b22f11c7dc8aa60cdeccae4e970ddbfda1afbe622b7fc6187

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