Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac8fd6eaa3d2ceb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 19:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c6faed6c3b6995b4914005fa11c11f1 SHA-1: 3c56ae566bb425fc8845797cfc6aa293e95b53ba SHA-256: 0ac8fd6eaa3d2cebc6101b52a5c5f1c8ed32febbf4c5484cec802f4e02eb9a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of external URIs, with one notable example being https://medvor.ru/uplcv. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious or phishing websites, aligning with the T1566.001 (Spearphishing Attachment) technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=chord+maroon+she+will+be+loved
    • http://freewest.at/43430491633.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141631bbc8ed---20622544752.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/boduf.pdf
    • http://begues.mobi/userfiles/file/sutegunedifunomi.pdf
    • https://techlan.pl/files/file/nosusekofenalidunakoju.pdf
    • http://asqcert.net/files/files/gebigogav.pdf
    • http://chickendaylacrescenta.com/uploads/files/deboxobosozipuwor.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/91259730501.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/75899183081.pdf
    • http://szm.hu/userfiles/file/50103817773.pdf
    • http://all-premium.com/user_file/files/furifunalazutowisipitir.pdf
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/litunurisokuponewozejo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5e130376---feredeluzilelapubegewo.pdf
    • http://marklaliberte.com/fckupload/file/57289386112.pdf
    • http://thegoshow.net/userfiles/file/99603488843.pdf
    • https://gadesign52.com/uploads/files/202109150354339811.pdf
    • http://onnetsolution.in/userfiles/file/sigosutepi.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/60052117761.pdf
    • http://movitecnic.fr/ressource/site-image/files/virugup.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/kituzabenivalosamize.pdf
    • https://webmenuplus.com/images/file/31437991097.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/90121074273.pdf
    • http://caogenzhiben.com/filespath/files/20210927155929.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/37714965261.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_off0000b339.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 16792 bytes
font_01_sfnt_off0000cb50.bin
a018b27ede622a6b46828519a6f578585ef989d8bbe9ee12d114998efacd94d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 10736 bytes
font_02_sfnt_off0000e3cf.bin
fc6c8b80e226ba5f3852322b9524beea798731c033773cc7b7bf637b6db0346c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16316 bytes

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