Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffbfc1e0b0b737f…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33391fdb7583c38e4f85d8e0a87e8376 SHA-1: 03425758646634ed711a9f293238150bc3fcb119 SHA-256: 7ffbfc1e0b0b737fa1c97fdf565a77dd2824e107b52e41bcae1c59cc30a4afcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=principles+of+economics+ml+seth+pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/60191263574.pdf
    • http://www.hussco-steel.com/husscofiles/files/delenotovatixesax.pdf
    • https://pecsikult.hu/files/file/vinuteje.pdf
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/lobosojaza.pdf
    • http://dr-onesrl.com/userfiles/files/gagagi.pdf
    • http://hotel-ambassador-nice.com/upload/files/balefigeku.pdf
    • http://polkovnik.su/upload/file/tinorivapedigopoxabekiwe.pdf
    • http://galettedesrois.eu/userfiles/file/40171955998.pdf
    • http://ccsl.asia/files/gogikigiseremexeweraw.pdf
    • http://tomboy2.com/images/library/File/bakimewiwoxep.pdf
    • https://newcar-rental.com/uploads/files/202109092100002623.pdf
    • https://anthonygillant.com/userfiles/file/68517955009.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/93397068417.pdf
    • http://congseng.com/uploadfile/files/tijogibofaxaxiret.pdf
    • http://abwingssuffolk1.com/uploads/files/gapegalaf.pdf
    • http://net-marketing.hu/images/files/fapuxu.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfdc8ae2f4---worekiniwuserufebifitof.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b74b88a25---gamulajinazibokoxu.pdf
    • http://tfforming.ru/d/files/77414938806.pdf
    • https://senfina.top/uploads/files/ganiwiwozugodezem.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/99894111245.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jatorod.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_off0000abfa.bin
871b861eedeedd10ea1d26715f59c0040d5f8f1f80db9705142f96de3222825c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFA 10724 bytes
font_01_sfnt_off0000c456.bin
b75df0c05c2e989118f1223cb29d4708160fee958974a889030917d230982f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 14364 bytes
font_02_sfnt_off0000e88c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16792 bytes

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