Malicious PDF — malware analysis report

Static analysis result for SHA-256 31586d5bf901c277…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 14:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed8a81c226db46863f350444f5ba972 SHA-1: f32753e3b84bfa72f94a21ab1a08710cc5454d10 SHA-256: 31586d5bf901c27740c8b4156e68d27b3cf723a7b3bad6bf65c3ce77ab650e87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.domaine-vrignaud.com/ckfinder/userfiles/files/5053913679.pdf
    • https://jamisonfurnace.ca/userfiles/files/defisopebevopegipipixixe.pdf
    • https://citytrafik.nu/images/file/4055677320.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/fonozuvarivazuxuvep.pdf
    • http://gcsiva.com/files/userfiles/file/zasamoredapovikapovasa.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/pikegumajerodap.pdf
    • http://dental-forum.ru/userfiles/file/kosabotagizekubutifex.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/91368358833.pdf
    • http://mixmarketing.vn/upload/fck/file/40638062448.pdf
    • https://chsins.tw/uploads/files/202109140106233478.pdf
    • https://praktijk-fix.nl/userfiles/image/file/tepawekuxoraso.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/74716062861.pdf
    • https://aedwea.com/upload/foto/45715197953.pdf
    • http://papianiarch.it/userfiles/files/90956600370.pdf
    • https://pmms-online.com/assets/file/gaxudewobumifemilelekano.pdf
    • https://osakaav.com/userfiles/files/20529713175.pdf
    • http://petrduchek.com/files/97190960115.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d131ac0f92---bodegubasorewuwaxum.pdf
    • http://artediapharma.com/upload/files/67910424163.pdf
    • https://larrialdiak.es/files/galeria/files/fopasodivukisefujujinaxig.pdf
    • http://szentimresiklos.hu/upload/file/vopugowogegepagubas.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffecf9824b---xitutajaluxotazogemafupi.pdf
    • http://templeton.sk/userfiles/file/96706421494.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+visitor+massacre+at+camp+happy
    • 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_off0000b2c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 16792 bytes
font_01_sfnt_off0000cad8.bin
6fc9b3b38f39ac8fb214050d35d151976b51e06d68adbd287c92c008e02fcbd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 15740 bytes
font_02_sfnt_off0000f31c.bin
74b1e880ca60d408b9c23fa328438a5b15e49e1d86a8134514f14c753acb7b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10632 bytes

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