Malicious PDF — malware analysis report

Static analysis result for SHA-256 3580c9bfbe8309cf…

MALICIOUS

PDF

69.1 KB Created: 2021-03-28 02:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a1aa2b2802f51f5f10b85848a82a27a0 SHA-1: 94182c0a812ad818450da5e6d00bef810f644eeb SHA-256: 3580c9bfbe8309cf4e304b4fc354393a0dbc4e953c6ad377b99d48d3f2d5b1d6
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous external URLs. The document body, though heavily obfuscated, suggests a lure related to 'drivers ed test answers'. The presence of multiple disposable and link farm domains indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

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://fokemale.ru/123?utm_term=drivers+ed+test+3+answers PDF link annotation
    • https://cdn.sqhk.co/sarunasol/iagfRvW/gakebojewogezab.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/9402411.pdfIn PDF document text
    • http://freshmind.net/thomas_calculus_12th_edition_solution_manual_chapter_1qfcn2.pdfIn PDF document text
    • https://turuposuka.weebly.com/uploads/1/3/5/4/135400354/nixuxosaweravadowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fff410c171e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5fca5a41e43b0.pdfIn PDF document text
    • http://hookup757.fun/gotimavuwigexizinojar7oeej.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/lamimesij-vexegowasesof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_60021694ab0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_6050eeeb000dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_601689c375791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_6011b186404db.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/m5xhgR0/baby_alive_baby_grows_up_doll_uk.pdfIn PDF document text
    • https://pukegivox.weebly.com/uploads/1/3/1/8/131856392/4361718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/39068428047.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/cause_and_effect_essay_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/convert_audio_to_midi_logic_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/relexasutipugesuguvid.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/final_fantasy_lightning_returns_trophy_guide.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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 5100 bytes
SHA-256: 9a5d279a26dafbc14a2295e307910db626607f59ddaf65e83578174eacbdb862
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10812 bytes
SHA-256: 1f991653630990fca7b7449541a1fe27c69dcf491bc7816f10f8cd948f8bd5c0

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