Malicious PDF — malware analysis report

Static analysis result for SHA-256 81df63b878c2ce66…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 02:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5522f7245111114322656081f9be9dd4 SHA-1: f1aba9132fd792151f47900baf8101965b54f2ac SHA-256: 81df63b878c2ce66e9bc9044e414cc3e7a5ca454ab40a610b367919012b4f42b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=john+wick+movie+download+chapter+1
    • http://www.polni.si/Images/files/xopinavisuto.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/fakeburolinogufi.pdf
    • https://soechi.net/userfiles/file/34573135257.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/toruramutosubakuxebuvem.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/100b6fdc4307fe879468e33b2c8c53f4/60038849387.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevugodapuvenesafeto.pdf
    • https://exlite.it/ckfinder/userfiles/files/rilepuxokejiv.pdf
    • http://spc1991.com/ckfinder/userfiles/files/91222651441.pdf
    • http://reckdance.pl/userfiles/file/81170550595.pdf
    • https://deepex.hu/hirek/files/9802077720.pdf
    • http://lovesenergy.nl/file/delaguxoximamavu.pdf
    • http://erdbau-rauch.at/38822943026.pdf
    • http://gramercy-grand.ru/files/file/xenojepet.pdf
    • http://files.ibiza-ferien.de/file/3489588604.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/74125737583.pdf
    • http://mijinmotor.com/fckeditor/userfiles/file/13004523167.pdf
    • http://wish-pharma.com/upload/files/43255744332.pdf
    • http://coinproject.com/userfiles/image/file/87746184244.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/12470227743.pdf
    • http://lubrifianti-auto.ro/files/file/39057261707.pdf
    • https://riminabda.sk/userfiles/file/10313494980.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45560692269.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_off0000c037.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 16792 bytes
font_01_sfnt_off0000d849.bin
12d44abe8556b91e8c3e4fb8ee3d832dca6eafcddd05f14b7f11ecd17aed6acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 21652 bytes
font_02_sfnt_off000110e9.bin
b9c1f8ae47063c2d636e04818a0daf6a9c399c7891042e11a41aa7a4c7f9feea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 10900 bytes

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