Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd105d0cfa23afb1…

MALICIOUS

PDF

76.3 KB Created: 2021-02-08 09:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ef104b8e4e8e58e39183437691c4483 SHA-1: f06c298a586c5252807afecb4e9517a36a1e0b80 SHA-256: dd105d0cfa23afb1c81a63ff235335f3cd5e442aad6ce436689a53186d45b55d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a PDF URI heuristic further supports the external linking behavior, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wb?keyword=automatic%20writing%20spirit%20guides PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ff46abd15282.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/gdgehfJ/65763175384.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/ifNqcXz/freeze_warning_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5ff6af2a52b93.pdfIn PDF document text
    • http://doctora.club/85214205999wlgxk.pdfIn PDF document text
    • http://remeik.ru/apology_email_to_client_templaterwcb3.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/fyijGZU/pokeball_plus_pokemon_go_auto_catch.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/eheicig/heavy_industries_clothing.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/dudedup.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/SSiaXgj/39060103490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ff90873503ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393026/normal_5ff1bc9765d3c.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/butorare-subuvawero-dopevaze.pdfIn PDF document text
    • http://leafester.online/fugue_g_minor_bach_sheet_musicb5bte.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/pKFhaif/bavur.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/7RtIgd5/9264346628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezajiduzut.epizy.com/pefuzovugiwunibaliru.pdfIn PDF document text
    • http://pilomewolax.epizy.com/46458016951.pdfIn PDF document text
    • http://suvowafavij.epizy.com/wororerebizude.pdfIn PDF document text
    • http://lavavoju.rf.gd/13111047052.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5440 bytes
SHA-256: bd01721bce0296c6dbe3a66d6dd79f4834a276a94b065ed6c2b75a1e267ef51c
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10588 bytes
SHA-256: b9d537df5762fd03e3859c2b81dacaafd51f6e6648c4ad1c78866b5baaf2ab50

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