Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d3508a810f1ec7…

MALICIOUS

PDF

79.5 KB Created: 2021-05-12 02:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7aaf50b3a6835ae52131bbc0af006d33 SHA-1: 2546eec334c1241e9cf786ae33c947ee0752045f SHA-256: 64d3508a810f1ec7404a15c5742ccb3474827158924257cf4a525d6dc3155008
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to contain metadata related to a book title and the wkhtmltopdf application, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://xajibur.ru/strik?utm_term=basic+and+clinical+pharmacology+katzung+2012 PDF link annotation
    • http://xasumemazekejo.scienceontheweb.net/lawujijufife.pdfIn PDF document text
    • http://sovetnik53.ru/26456470785dspqe.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/lelixotuvo.pdfIn PDF document text
    • http://fherixq.com/garmin_edge_510_page_setupl58wq.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/painting_kitchen_cabinets_before_and_after_photos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_601b1cff825ef.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/tujuan_pendidikan_agama_islam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fc7a8f51ab06.pdfIn PDF document text
    • http://zootime.store/grounded_theory_coding_processt6npo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_601dfac7b144a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_601afd21c432a.pdfIn PDF document text
    • http://whalesqpa.fun/remuvejilinimokomimisumf802l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffcd4a7b3188.pdfIn PDF document text
    • http://mebelintera.ru/pojebuzidetojipedo62cut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapumodexajo.rf.gd/pajumonuguxoteb.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_6e85f9f4c916439f9fbdf941635b625e.pdf?index=trueIn PDF document text
    • http://pilogovebezekem.epizy.com/monster_energy_vs_red_bull_vs_rockstar.pdfIn PDF document text
    • http://titasukutisun.epizy.com/excel_sheet_work_online.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/48101006174.pdfIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_33c1515b9e1e4b3eb72a7efd4a32397f.pdf?index=trueIn PDF document text
    • http://fitimulosegi.epizy.com/13378604568.pdfIn PDF document text
    • http://lubudag.epizy.com/86400186461.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_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 6080 bytes
SHA-256: 66c0aeaf53d7e96c80c4840b4efd0bf3f89dfb2e5eba4c9ce5a2aec8bee3bc55
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11204 bytes
SHA-256: 3f233e8b98e9fcec11ab22d5f443f62883c83fcf2fb796121c82775753b5cf3d

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