Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c6d662980200f7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 21:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 875aa82f4822fb3f78d698346a839f0b SHA-1: 62f7418a68d4dc81675489098f4bd82dcdad177b SHA-256: f0c6d662980200f798ea66862bc4def46e43ad55807eb5e54e46fee41493dea6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=last+day+on+survival+mod+apk
    • https://luxesystem.site/js/ckfinder/userfiles/files/43301386642.pdf
    • https://fobh.net/userfiles/files/vamepumesubobisatite.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/jomolovorafixumejolu.pdf
    • http://dezmaster.com/userfiles/file/barakewag.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd6bc1e4e---nukabiturizob.pdf
    • https://stratasphere.online/userfiles/file/bimikapazabel.pdf
    • http://perseverance.cyou/updatefiles/file/87567681378.pdf
    • http://dagmare.de/userfiles/file/suwiwoluba.pdf
    • http://fosterfreezesantarosa.com/uploads/files/12397044166.pdf
    • http://robfredo.com/userfiles/file/figuzaxorazetibogumevuli.pdf
    • https://catbasailing.com/upload/fck/file/wimivoxexatawejumuwirufe.pdf
    • https://alamansyria.com/userfiles/file/tipukariti.pdf
    • http://metzlerranch.com/userimages/jalipijukulozajaridit.pdf
    • http://peak-experience-japan.com/images/blog/file/wugulujelulutozamum.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/tifajutozudujajez.pdf
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/35089901387.pdf
    • https://speedwayinfo.hu/uploads/file/69112402465.pdf
    • http://thingsantiquesla.com/userfiles/files/tizebe.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/38830982222.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ec38af68b72ad8cf38c2c0b6feba5a5c/91338916942.pdf
    • http://elskenecologie.nl/files/kenaromulux.pdf
    • http://bestorkate.com/uploads/ckeditor/files/728818643.pdf
    • http://intemhathanh.com/img_duhoc/files/96309585706.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/39627173565.pdf
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/14015480241.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_off0000d720.bin
35bf254e854444ae0515ec411f5de6c717694189f2cac08b84c5237ce648f5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10752 bytes
font_01_sfnt_off0000efd5.bin
8bc069d63e505a115c5c20627d6b35462344e1c9d58e1715294fa3829852089d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 17208 bytes
font_02_sfnt_off00011c79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes

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