Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c3aeccdcc1fc98…

MALICIOUS

PDF

70.4 KB Created: 2021-02-07 00:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca48dd0bb437e567ed4b9cb3ef4edd30 SHA-1: cee14048ccbe1ca9902455f518b94363465618e5 SHA-256: d0c3aeccdcc1fc985ed5f4c2163c6171922ed19aa2d8b0d0a3fd95064f555d90
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, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a tactic to obscure the final malicious destination. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to harmful content.

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://bologen.ru/123?utm_term=guide+to+medieval+life+portfolio PDF link annotation
    • http://fumigatoff.online/funusobosuninuccoei.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/lakeloxorig-sejur.pdfIn PDF document text
    • http://docita.fun/bestway_filter_pump_58381_instructionsctofn.pdfIn PDF document text
    • http://setakini.22web.org/dudofugogizuvodomozaxub.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/9933911.pdfIn PDF document text
    • http://glav.info/soft_tissue_cavernous_malformationgu0yh.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/zapogoxeduk.pdfIn PDF document text
    • http://classicalnaturally.com/vifakegus75qf6.pdfIn PDF document text
    • http://lasns.fun/64959742856zrh58.pdfIn PDF document text
    • http://istlan.fun/characteristics_of_modernist_poetryq5jxo.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/fb9430.pdfIn PDF document text
    • http://voirlo.xyz/endeavour_energy_sustainability_reportdpb0d.pdfIn PDF document text
    • http://nukels.xyz/jixokqckzj.pdfIn PDF document text
    • http://muslims.net/dragon_ball_z_budokai_3_pcsx2_cheatsujnyh.pdfIn PDF document text
    • http://uspex22.online/pose_streaming_vostfrfkh3f.pdfIn PDF document text
    • http://fridgeservice.ru/pejuxebubawudonixevats4ei.pdfIn PDF document text
    • http://sellforce.ru/current_weather_report_at_chattarpur_delhij6j6y.pdfIn PDF document text
    • http://crawlmqyu.space/why_answer_to_everything_bookb438c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robinovedibepo.epizy.com/avanceon_limited_annual_report_2018.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/macbeth_analysis_questions_and_answers.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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 5100 bytes
SHA-256: 68f97f1e3d98f4a089b1f5b176f2326076898b08a596a21c7505accb0ece2113
font_01_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 10508 bytes
SHA-256: f48b5117870fdef8da544d2f7f9d3f528c664df586eb0cb78c9dfac039268b51

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