Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c88f814725a4a6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 22:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47315b9854a04f9595ec4124932beb30 SHA-1: 0f13a5855a7a57018bff083722350930ef5824e3 SHA-256: 01c88f814725a4a66713868e04f20e67a59fcdd8ca8b9ae28680fa5f2711aea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The PDF's structure and embedded links suggest it is used to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=average+rate+of+change+given+two+points
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39597dc13---80744392155.pdf
    • https://fertilizerproductionprocess.com/d/files/16133521952.pdf
    • https://tepihtrava.rs/files/siniruxomanoteg.pdf
    • https://guruvinodji.com/Userfiles/file/ziroroganowaroze.pdf
    • https://pannonfinanz.eu/editor_up/kezisujigojarubidogo.pdf
    • http://benthanhsgfarm.com/images/uploads/files/17739434086.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-14/20210914034644762064.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1637e738---35763759534.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/mibozabakiwegudomepati.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/fokaza.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/xudapewelalekenesimodo.pdf
    • http://polipack.ru/content/file/64035725146.pdf
    • https://goldenlinejsc.com/userfiles/file/mivikeroj.pdf
    • http://www.cottagegrad.ru/files/file/63443952648.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/1781434075.pdf
    • http://massimobertoarchitetto.com/userfiles/files/32177915570.pdf
    • http://cuacuongiare.vn/upload/files/74827981384.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/21216678954.pdf
    • http://oskarmak.com/userfiles/file/niponedosi.pdf
    • http://egitara.com/upfiles/files/55128040212.pdf
    • https://mediaskills.rs/files/xafoxagurase.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da94.bin
d7935fe2767862b53561a4cc454a2c811efb399022b76149da095ef63f9be659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10848 bytes
font_01_sfnt_off0000f3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
font_02_sfnt_off00010bc9.bin
f57d33dd7e4860a901e62a2baf15a1af50e97aa1d14e0527388fd4b8242aa0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 19412 bytes

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