Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e9f2f77e6f72e4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 05:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76c31d810888e0ce1036d7f0d5b850f9 SHA-1: 330067f928fa385f47806e4977f7c7122bfc091e SHA-256: 46e9f2f77e6f72e4c473899e696f3ff64edfb52e7371012518cd8049777b727a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, with many hosted on disposable domains, indicating a likely phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the PDF is used to generate traffic to a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cncunse.com/d/files/volibazuguveratunotudoza.pdf
    • https://reniuved.it/file/zulaliduruzanuvarilev.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/luvirexaxup.pdf
    • http://koala-al.com/d/files/nilirekatafeludaxeduro.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/kelisavidapevusedajizekit.pdf
    • http://csc0851.com/userfiles/file/20210903232732_fl9e5w.pdf
    • http://hpworld.hu/data/pic/Image/file/xarisawolusekawikexo.pdf
    • http://massageindex.nl/images/uploads/sikovuxaguzuse.pdf
    • http://titusauto.hu/kepek/file/97815613355.pdf
    • http://thesecurityguardunion.ca/userfiles/files/gapunalorurelilugobum.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/8723874373.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/8962363694.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f764a7a8---galof.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/gejorefavopuxog.pdf
    • https://wisestudentz.com/userfiles/file/padiduzedupelezizo.pdf
    • http://vecsecity.info/editor_up/karefifanedu.pdf
    • http://hanasushipickup.com/uploads/files/pupuvazopivafi.pdf
    • https://cottonweb.net/userfiles/file/nuderite.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/28131911111.pdf
    • http://dycelife.com/userfiles/file/22200638661.pdf
    • http://sinners-party.de/media/file/dedisewo.pdf
    • http://meubelenindex.nl/images/uploads/sukonum.pdf
    • http://nyitotthaz.hu/userfiles/files/xegenuvojom.pdf
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=agent+dash+mod
    • 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_off0000d581.bin
74dc911d47de47405bca4ed9516487c486c28fe76781b88713a7b9da990e4e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10436 bytes
font_01_sfnt_off0000eccf.bin
2822fb24a7c1e236dab1e387de3d8be6f0da7481f8a4698d9fd9d0fe28aeedc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 21652 bytes
font_02_sfnt_off00012508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16792 bytes

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