Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb986f3257817afc…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 06:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 836b1b2932a8576082dfaa43a4ae7f95 SHA-1: b37756f4a9da92c807a549b1e5966b8a3244465c SHA-256: fb986f3257817afcf7bcf8dd9c46149dedee43969013ada8d0cd6d46c27562ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a large number of links on disposable hosting. No scripts were extracted, but the presence of multiple external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=premium+vpn+pro+apk
    • https://kidneystonetreatment.in/userfiles/files/33765636830.pdf
    • http://radecznica.pl/userfiles/file/97145565730.pdf
    • http://abwclayton.com/uploads/files/netuviwejebegifefidepasa.pdf
    • http://monteconsultants.com/image/upload/File/85611596968.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/91a5b042a588e7c8db4fdaf12d538a52/84572569132.pdf
    • https://panelshock.com/userfiles/file/devevivezakopapukuzipav.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vewulowemejusefesimatap.pdf
    • https://transmilenio.net/datamont/userfiles/file/3628253833.pdf
    • https://underworldgear.com/upload/users/files/7065472179.pdf
    • http://fatfailogistics.com/fckeditor/files/file/demonatimokotujozupumowat.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/12265399357.pdf
    • https://konchris.com/userfiles/file/1631066956.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevaseludadikutenowuxi.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dd6aca10bc82f347fdaf2b6fcd6a5461/dutixaruvezubuvuva.pdf
    • https://harrisitalia.it/uploads/file/80508344358.pdf
    • https://ip-pharma.net/data/files/nolafaxedakoke.pdf
    • http://mimarkamilozkartal.com/userfiles/files/47884855297.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zijifisuxigapokaferiw.pdf
    • http://tano-cable.com/d/files/jatevelafofalozi.pdf
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/favazuxaxozinugaliput.pdf
    • https://editionsitaliques.com/userfiles/file/xogomorakudoxeref.pdf
    • http://w-f-l.de/user_img/file/73338461424.pdf
    • http://alajwakh.com/uploaded_files/userfiles/files/vuwibebusenuxinewigibon.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_off0000b3d5.bin
004b4d103f6bda7daea7e32f76730d406757ad058930d833027bb3a3b1861c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 15532 bytes
font_01_sfnt_off0000db3e.bin
75f24100f9bed36cdd325522c948c02ab7cfe553f6c9f4851fa02429fa85bfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10360 bytes
font_02_sfnt_off0000f29a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes

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