Malicious PDF — malware analysis report

Static analysis result for SHA-256 59eac544734cc58f…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 07:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 095e1ab05b60ba3b7f9aa0a5ab4cd10d SHA-1: 3d410aed04931af0a6245aa22854e87a421f66bc SHA-256: 59eac544734cc58ff0276900568a59b7615c6f66d462bdecfd04d3db6f7ef97c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary external URI pointing to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a potential SEO manipulation or distribution scheme. No scripts were extracted, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=the+giver+movie+vs+book+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406455/normal_602625a1d754f.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/Ba7Igcz/boxotu.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/gieVihT/8759630364.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/c4LMiay/66222104233.pdfIn PDF document text
    • http://setlyb.online/film_synopsis_examplesbeml.pdfIn PDF document text
    • http://jafetezaki.iblogger.org/21426095312.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/4jgr9ie/jack_allen_adventures_in_odyssey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fd77dcab5d96.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/ggzicje/suvivebojeveviligodirujop.pdfIn PDF document text
    • http://housefashion.ru/55468743054u6962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5ff9a858007bd.pdfIn PDF document text
    • https://cdn.sqhk.co/bonidanem/giU9ide/starfall_calendar_october_2013.pdfIn PDF document text
    • http://digitalcalakk1.xyz/fazejwy5vr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffbce7b6d4fa.pdfIn PDF document text
    • http://slamelina.website/7156696840888ln5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukijujer.rf.gd/bldc_ceiling_fan_full_form.pdfIn PDF document text
    • http://wagarimorule.rf.gd/bodoni_classic_roman_font_free.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/answers_to_crossword_puzzles.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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 5160 bytes
SHA-256: 6dbdcea06d3b1149c50195afa962eaa8287ca5420f5a1f211b01fec0e5aedad8
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 10820 bytes
SHA-256: 05ce0d6987d956f2cfcff4eaf338e59e969794691611fb3872fae24c766afb6b

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