Malicious PDF — malware analysis report

Static analysis result for SHA-256 91935ff2e1ac0ee2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 09:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 62971c3383a86352b44a645028a8f314 SHA-1: 1caf03b56e9b74af20d70f470ba0764a7601984f SHA-256: 91935ff2e1ac0ee237cc92be83ad9518341cc5460a5317f442184c9467980db5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the use of link farms on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9197

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fokemale.ru/award?keyword=reading+comprehension+test+pre+intermediate+pdf PDF link annotation
    • https://cdn.sqhk.co/baxajufim/6J1jege/wakedemunexuzojetolire.pdfIn PDF document text
    • http://draiwenstore.online/samsung_rf267abrs_refrigerator_leaking_waters2jw5.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/eijLrjc/54695954622.pdfIn PDF document text
    • http://zawateminito.iblogger.org/right_to_freedom_article_19_to_22.pdfIn PDF document text
    • http://visanekis.iblogger.org/50698403047.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/1iipBhf/life_is_strange_comic_issue_13_release_date.pdfIn PDF document text
    • http://proba7.xyz/xofoweriwujurowdge80.pdfIn PDF document text
    • http://goriwekaparagi.iblogger.org/akademia_pana_kleksa_ksika.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jiiiwha/algebraic_expression_exercises.pdfIn PDF document text
    • http://lassituda.online/5759876319kgrgu.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/21812653933.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/kjahagi/pet_run_puppy_dog_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fu81jti/xunulemuvewalegosali.pdfIn PDF document text
    • http://migriruy.ru/how_to_use_the_clean_washer_cycle_on_electroluxbzgn4.pdfIn PDF document text
    • http://confirmationhelpcenter.com/nikon_prostaff_rimfire_ii_3-9x40_bdc_150_rifle_scope_16329uszl7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufonokimilije.epizy.com/78129590501.pdfIn PDF document text
    • http://mufomasugom.epizy.com/how_does_public_policy_impact_entrepreneurs.pdfIn PDF document text
    • http://povosiz.epizy.com/kozepopibimosugi.pdfIn PDF document text
    • http://wudotope.rf.gd/gedawadeku.pdfIn PDF document text
    • http://releboxodaw.rf.gd/pearson_physics_textbook_online.pdfIn PDF document text
    • http://larazeratu.epizy.com/92676035839.pdfIn PDF document text
    • http://soxixebupi.rf.gd/55581350149.pdfIn PDF document text
    • http://ruzunol.rf.gd/xavirude.pdfIn PDF document text
    • http://tunazafagid.epizy.com/90141237329.pdfIn PDF document text
    • http://gozulejawefufap.epizy.com/simple_present_exercises_english_for_everyone.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 5544 bytes
SHA-256: e7b58024b56ad8058da9aa21c7401ec7c54b9ad13dac3986d913df72994301fb
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 11980 bytes
SHA-256: 40ead974b684f7e0618ef397ce297bfe0247b9971403b5c7532f9b2f5934d57b

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