Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2eafc126990c91…

MALICIOUS

PDF

76.5 KB Created: 2021-04-19 22:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 635fbb7a3347b728617169c693f25f6c SHA-1: cc5d42c559d7cbc5a4a566c66b0b3a87865a496d SHA-256: cf2eafc126990c9129a71a242b163c84f26a7b95e72ca50c4d88f6fb07c5699a
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, while appearing benign, is likely a lure to disguise the malicious intent of redirecting users to external sites, some of which are associated with potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=tips+on+how+to+be+a+better+medical+receptionist PDF link annotation
    • https://cdn.sqhk.co/refevebux/d3idKij/langrisser_i_ii.pdfIn PDF document text
    • https://wufijoduk.weebly.com/uploads/1/3/2/3/132302847/sevilurew-buvaraw-rusafoxa-gesiwoxusiviz.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/1hazckd/k_map_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_605a7055a2d87.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/AjcY2ji/dragon_hunters_cartoon_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/iaIhfkv/fikalususesemipukefev.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/aZifBlv/mobile_passport_vs_global_entry.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/5040410.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/fiiGiiA/alien_arcade_game_online.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/awaken_the_giant_within_gujarati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_60005f617d724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_6059a7fd26926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_604186caa4c57.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/iVjajgS/biwizafonupukiwubevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_6009f28ea4744.pdfIn PDF document text
    • https://vefenebef.weebly.com/uploads/1/3/4/8/134885139/5186a47b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6012b77c5651c.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/gckRyjh/67988947023.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/toefl_preparation_test.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/bEFjhji/final_fantasy_xiv_free_trial_ps4.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/babokujebetog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/aquaculture_technology_and_environment.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_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 5492 bytes
SHA-256: 60847aa291605190c1e23112560bc43b90808c4626a553242a26934262acc9de
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10224 bytes
SHA-256: 34608df96cf9cb4785fae52bd65842ca734abc33deacf6ab8c60c73b8568d4b4