Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c3b70e4abfb1f2…

MALICIOUS

PDF

75.4 KB Created: 2021-05-31 23:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815f946e28d3d333b2e8a5774fdb5211 SHA-1: 251e331d6d0f50c27ce65bb21da1ded285c3dbce SHA-256: c6c3b70e4abfb1f2d50a25ba530f123c1b0d2c6f688a0e9a6eb4b7ad7b2f4681
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text related to 'Test ingresso bocconi 2018 pdf', suggesting a lure. Numerous external URIs were extracted, many pointing to link farms on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://huntic.ru/pbw?utm_term=test+ingresso+bocconi+2018+pdf
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/vegop_vokowafetazut_labutokufozu.pdf
    • https://rogofimek.weebly.com/uploads/1/3/3/9/133997266/369bf5b2.pdf
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/8398aa1fa14.pdf
    • https://noderewowiful.weebly.com/uploads/1/3/4/5/134596184/dakizidutajegugajir.pdf
    • https://cdn-cms.f-static.net/uploads/4462036/normal_6043fd21ee8d4.pdf
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/bipejakum_balam.pdf
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5fc7e2ab4dfd7.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5fe6a6afd2398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvesiwowegu.pbworks.com/f/supax.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144421374/9768212217.pdf
    • http://lijegazoz.pbworks.com/f/xagokag.pdf
    • http://lakebimutep.pbworks.com/f/88525280427.pdf
    • http://lekuzax.pbworks.com/f/fojevekemetenusurideko.pdf
    • http://visetululiv.pbworks.com/f/wozerig.pdf
    • http://bekivuxuga.pbworks.com/w/file/fetch/144425652/caractersticas_del_enfoque_cognitivo-conductual.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144423312/what_does_rikki_tikki_tavi_represent.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144425055/desafio_del_amor_para_padres.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e391.bin
f4abb3c39837d3cd571abf416ecebecc57c18f48aaab2d30e59369c4a98958e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 5692 bytes
font_01_sfnt_off0000f708.bin
d4bec6ffaff135669cc275ab0d0781af8812b138f8a7ecff14059dff131dba81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 12268 bytes

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