Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2ac0315f603956…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 04:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d63fa3a7c0044f289e9c8539d6cddb35 SHA-1: 35aa7f6c9a7dc57b1b998cb4227e12d0b5a92fd6 SHA-256: fb2ac0315f60395673604488fe368d87b908d8fe16f92331b7a7378b114a3cf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm designed to obscure the ultimate destination or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a strategy to host multiple PDFs on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://dream-mebel.com/pic/file/27781471972.pdf In PDF document text
    • http://ilyxrace.com/userfiles/files/xumesobegodib.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/66682374665.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dibimabimedotebewijume.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/47971591701.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/59590030022.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pavumutorelafeditum.pdfIn PDF document text
    • https://edusfera.pl/upload/file/29822055847.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/xutezafupimakinudozaduw.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/36101882509.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/mivinogujafepijosuma.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/03f6bb04f14d261d4c6019f3cc8852b8/sidumukiwuwugonatigupotoj.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/14717219890.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/nafefuxabasameja.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/67743344124.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/rudedam.pdfIn PDF document text
    • http://holzweiss.at/xiferoposamor.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139988bb7a78---zizozebal.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/84562192070.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xawekixezemilitelugowefib.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8907369122.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/42578737152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nfc+apk+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 17420 bytes
SHA-256: 5bb41f9d58a529f8dba015ee04fe82fd70e085a4edf1b9dbbfdcf628134eb798
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10236 bytes
SHA-256: 803a027d92fd864f4371890886aefc0974070577ebce33b91106ed3a742191b9

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