Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c76fd664ad5986…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 05:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19bc9691c7d1d741536ce24590b74155 SHA-1: b38dde69619eef4595dae194df666091f88e2898 SHA-256: 19c76fd664ad59868d7bb19ece8f1f378b8a2e7c1ac83a59162c8af452d8f93b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=walkie+talkie+communication+apk+mod
    • http://uralteplostroy.ru/content/file/suginoxovaram.pdf
    • http://z-sinpro.com/upload/files/70693694777.pdf
    • http://risorsaterra.it/userfiles/files/97225505125.pdf
    • http://tpt.taipei/asset/uploads/files/fifarukamukosopan.pdf
    • http://saiprogetti.net/userfiles/files/jizagaralunujofajujiw.pdf
    • http://dietaltop.com/userfiles/files/3227405460.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/99212293016.pdf
    • http://mtkshop.com/images/uploads/file/22347921765.pdf
    • https://krossi.ru/images/content/files/rapoforuwosofalurudek.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/86331055651.pdf
    • http://benetalent.com/upload/files/fesetemulipezapom.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/82210572337.pdf
    • http://moderncarrent.com/user_img/files/87833304123.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/lafaduf.pdf
    • https://yuvasarkar.org/userfiles/file/gisidovepanaz.pdf
    • http://aa-nusd.jp/64269347506.pdf
    • http://jolanyee.com/upload/files/202109170151594019.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/718599c5ef0c273dd95e9058f2f39153/nijidosajodik.pdf
    • http://pomocnaukowa.net/Upload/file/44200898689.pdf
    • http://www.ekoforte.com/upload/file/46836005121.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/golafajowefemolavodekatip.pdf
    • http://hkwwta.org/userfiles/kalox.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_off0000d287.bin
9264c58ae4985b5adb2ef9bb3692c75b3ebbac7cc4be4b36b91cdf6ebd495d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 16380 bytes
font_01_sfnt_off0000fc7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16792 bytes
font_02_sfnt_off00011496.bin
4d40484fe71c79a6e903e1a1671e55a9bed8848451896cd3426d7517ca7f6647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 10592 bytes

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