Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54cb8da883224d0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 14:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37f73504796d3dc74e0483909b54556a SHA-1: cee0e83fbd6eac8e7770d2f28ea5e08bc6cd4405 SHA-256: a54cb8da883224d070f869723c99c1be95ed976a524ac098d0b0950a3881276c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=conjuring+3+full+movie+online+english+subtitles
    • http://lindendirect.com/ckfinder/userfiles/files/fuxazidofomumobagixe.pdf
    • https://markmont.eu/editor_uploads/system/files/tipemafebarubeg.pdf
    • http://zeci.nl/im/image/91637200109.pdf
    • http://vdi.vn/userfiles/file/rikanuloxotunupavow.pdf
    • http://labonguyenhoang.com/img-chamthi/files/44854866189.pdf
    • https://huaienclinic.com/uploadpic/files/gusawenosabazebafof.pdf
    • https://okazdedziecko.pl/_files/Media/file/zevujesolisasuzubare.pdf
    • https://bold-iot.com/uploads/files/202109091250439301.pdf
    • http://forepic.com/_UploadFile/Images/file/8943684138.pdf
    • http://architettodrabeni.it/userfiles/files/57160818932.pdf
    • https://lesrimaudieres.com/images/uploads/file/21770361090.pdf
    • https://atrax.hr/files/wileg.pdf
    • https://eseninternational.com/uploads/files/1480058810.pdf
    • http://gernano.eu/gfx/userfiles/files/vozizulo.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/41601847375.pdf
    • http://tulga.ru/editor/files/pazozuk.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0f1dbf68---85940873529.pdf
    • http://phdpecs.hu/userfiles/files/jenadujomurotuboz.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/pejusonujamaxezokij.pdf
    • https://amigo-shop.105h.net/upload/files/waseratirimurijorekef.pdf
    • https://olterus.net/contents/files/98067161631.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fe449d88ee8459028d481cc8ab4bdf6a/9827157532.pdf
    • https://marbletreasures.com/uploads/image/files/mifotenewogud.pdf
    • http://abwbaltimore.com/uploads/files/tenamezesujimez.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_off0000de41.bin
6df1bcd679446205e7bacef119a0e260de7e699197a5814974bbdb02c89f4c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 16664 bytes
font_01_sfnt_off0001092c.bin
6fbb81051e00408ddd97b39bd5b05fc7cc35031a0835ea1e2dbf3ab3b42dd01e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 11140 bytes
font_02_sfnt_off0001230c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes

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