Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63ea8afff6c4ea0…

MALICIOUS

PDF

103.3 KB Created: 2021-04-09 05:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 96948d373001c3143bd8f90178d52851 SHA-1: 4af48e2560b7ebe233cb1122f3bea0215aea0a2a SHA-256: f63ea8afff6c4ea008859d0d00b53c3a83c0f8232beca65d1eb9de0a298516c0
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 domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'computer books list' and 'wkhtmltopdf', likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=computer+books+list PDF link annotation
    • https://cdn.sqhk.co/bisidilit/e0smjh2/situs_inversus_with_levocardia.pdfIn PDF document text
    • http://nipuxikupiluzep.iblogger.org/ropadowafapuselo.pdfIn PDF document text
    • http://kuxakedu.iblogger.org/ct_dmv_test_questions_and_answers_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_601b74fdb295d.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/lMsgjUe/shoot_em_up_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ECcxja5/30098784837.pdfIn PDF document text
    • https://cdn.sqhk.co/fokudiwun/gfgcjfG/86502884807.pdfIn PDF document text
    • http://sabaroxuxonefib.iblogger.org/compare_scarlett_2i2_and_2i4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fed723b1c47b.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/XigT5ha/school_business_manager_jobs_london.pdfIn PDF document text
    • http://fexavakagejil.iblogger.org/31390362346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_603c61cbc18d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601e01b54fca9.pdfIn PDF document text
    • http://nosaraxes.22web.org/vurujefikutesogitonedavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdc656c-2164-48ac-a535-78fd37440797/37306614039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb12f67-7900-46a7-887b-66e80e285d17/motiwenidixugavelaxukare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3699e3-1f32-4e11-849a-3fcaff93eb2d/67247993458.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/85151009217.pdfIn PDF document text
    • http://tepiwoz.epizy.com/6218931092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de852588-4b65-400c-85a0-e805b5d77cb8/how_do_you_use_a_whirlpool_cabrio_platinum_washer.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/farudejidoxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000bf9e9-156a-44ab-97cc-8a0d1898ba96/wexufusuwoligotepagode.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/types_of_beaks_in_birds.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_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 4864 bytes
SHA-256: fa68699172e16ba87d674ca9d44defdabe9f1fa2262da2efbe09f23cc9518141
font_01_sfnt_off0001640d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640D 12952 bytes
SHA-256: a7ab5079e85ec4485f1a8a284dd98d4dbd8e89cc4530f664e6789d5f5a178500

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