Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1169cab01594471…

MALICIOUS

PDF

76.8 KB Created: 2021-03-02 04:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2cc3fa0c9a0baae9d4936e9c3a67cdf SHA-1: e9c87b845769f1bde4e2109cd0e75a9512519657 SHA-256: f1169cab01594471002f8a3c92f2e42192326b2a70f206145dc461f48c9339c3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one specifically designed to mimic a search result for 'what is the chemical name for epsom salt' and redirect to a suspicious domain. The presence of numerous links and disposable hosting suggests a link farm used for phishing or malware distribution.

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://golowaki.ru/strik?utm_term=what+is+the+chemical+name+for+epsom+salt
    • http://naturaitalia.space/jimibijenezoxidefukimineba17m7.pdf
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fcb4de2da5fd.pdf
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/wofuva.pdf
    • https://cdn-cms.f-static.net/uploads/4379618/normal_601ee2beb0f38.pdf
    • https://cdn-cms.f-static.net/uploads/4450048/normal_601f9c9ddb7dc.pdf
    • https://cdn.sqhk.co/tosilura/bsjtnA9/mubegoberoxi.pdf
    • https://cdn.sqhk.co/tejilunuf/d2sgdha/multiplayer_games_pc_free_online.pdf
    • https://cdn.sqhk.co/moxibusas/gLgeMgf/88091334719.pdf
    • http://frasqen.online/long_acrylic_nails_coffin_shapet2pbl.pdf
    • https://cdn-cms.f-static.net/uploads/4480756/normal_603636ac8108f.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_601237f3ee26f.pdf
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fe4dbb871f91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jirabasojexosud.atwebpages.com/mary_shelley_frankenstein_chapter_10_summary.pdf
    • http://pulutugorivexek.atwebpages.com/mvcc_financial_aid_email.pdf
    • http://xabudavadeguvo.myartsonline.com/54125541498.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_off0000f06e.bin
dcb9a4065b704b7cc5d7c0bbe0285809509038b33bb73bc60c1d0dcd25887a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5268 bytes
font_01_sfnt_off00010237.bin
b4034c1af5c0dc2dcd7bd600dc3531e1cf4170687be4456108e5fdf9418eb2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10488 bytes

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