Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4fd4de821ae5a7…

MALICIOUS

PDF

76.8 KB Created: 2021-02-25 09:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f9d7e0ba702d0bb227f753ed5b5be323 SHA-1: 761ac8d525f0bf09340803f6ebcac90f329eea9d SHA-256: 5c4fd4de821ae5a79bd8724658f670eb589f56961f13170757abac6a2b728325
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to salary information, directing users to external links. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=how+much+does+a+health+and+safety+officer+earn+per+month PDF link annotation
    • http://xubaseki.iblogger.org/the_art_of_war_full.pdfIn PDF document text
    • https://cdn.sqhk.co/pawexedibib/nYjay9y/painting_pumpkin_ideas_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/x79QOid/24541160538.pdfIn PDF document text
    • http://fortuneocredit.com/zarebejenivagutogotlnyaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/cjjgijg/nuxode.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/km0giNE/17738519859.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/soviet_anti_aircraft_tankg7wel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_6009da485cb3f.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/CjgCAHN/e_coli_infection_in_dogs_pictures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404524/normal_5fc6465ce7976.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/danby_dehumidifier_buttons.pdfIn PDF document text
    • http://meetlait.pro/73970349472gjcws.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fcc48e5019ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://surafupomef.epizy.com/69817947636.pdfIn PDF document text
    • http://jivobolalozula.rf.gd/transunion_credit_report_free_annual.pdfIn PDF document text
    • http://paxokebarunune.rf.gd/tintin_film_streaming_ita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5432 bytes
SHA-256: a9213f5fff7203f9fdee8af0b572834b36230fc48c2b4129f9daa4b5c1af27fc
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10236 bytes
SHA-256: a948bd20665c6a9faa32788190b44b5e4347dfd2f429bdb7c847dcb24ea02332
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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