Malicious PDF — malware analysis report

Static analysis result for SHA-256 87221d87e47b3a27…

MALICIOUS

PDF

82.1 KB Created: 2021-05-14 03:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 664804ea572862c50162f8856fb6521f SHA-1: 4a932e2c59fb4d6e2a93eee8cb81c1b5615de1df SHA-256: 87221d87e47b3a27b2429a2953b4c6954dd0bc8aba77d4285e1cc46666cb3c66
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm designed to manipulate search engine results or direct users to potentially malicious sites. The presence of ClamAV detection and ML flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=norwegian+wood+haruki+murakami+analysis PDF link annotation
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/tuzalavuru_newaremajog_nixagejunom.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/TigugdE/hello_neighbor_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6023f09cb1480.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/hgjgdnn/fox_adventure_shocks_jeep_jk.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/dBjjjMf/xepimenuvovebalaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fc8b2dda5f20.pdfIn PDF document text
    • https://pipovako.weebly.com/uploads/1/3/5/3/135300091/e8e3785f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_606a842442039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_606a19c93d455.pdfIn PDF document text
    • http://believes.space/how_to_make_fast_money_online_in_south_africandypa.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/c6je35a/biaya_sim_motor_2019.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/pipabal.pdfIn PDF document text
    • http://frut-tree.site/pavizixarubisoxojunijefaodkuo.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/ha1gdmL/56168004791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5ffdb1af173a0.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoziku/eAohggg/8572584454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 5464 bytes
SHA-256: a6f4d1b3a1d2688f398382e514ac676c0d3c79b1634266f1c12b5366b31ad9e2
font_01_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 10884 bytes
SHA-256: b8e83610b0ae62792303f9baaba3557614cb7187b9749ef6a945f26ead3b169e

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