Malicious PDF — malware analysis report

Static analysis result for SHA-256 7304fca810c148b8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-17 11:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53b2b26d68f7c2803da3ba1cd691dc41 SHA-1: 6dd9ff5cf9acbf2372b10eacb4c5b6e4bec4ee54 SHA-256: 7304fca810c148b893db304a06d8be23df9181c443219a0d656dfb94b8828574
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by heuristics, indicating malicious intent. The document's structure suggests it's designed to trick users into clicking a link, likely to a site hosting further malicious content or phishing forms. The presence of numerous external URIs, many pointing to potentially disposable domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/vodoz.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/rezududiledalapeketa.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb345504f5---rojenufopemivavobupegeni.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/70884179917.pdf
    • http://youil.org/userData/board/file/rotimavu.pdf
    • http://lizhechem.com/upload/files/22160886304.pdf
    • http://ownlines.com/upfiles/file/60626350876.pdf
    • https://abcoegypt.com/userfiles/files/40420716672.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wuvanomorezuj.pdf
    • http://klemanpince.hu/files/file/38072122428.pdf
    • http://dentalclinicbangalore.com/uploads/15633290261.pdf
    • http://innovad-ltd.com/userfiles/file/zatanifadubejesisukikes.pdf
    • http://dolonchem.com/upload/files/25213562855.pdf
    • http://mikomisushiwc.com/uploads/files/15170021485.pdf
    • http://imosa.asia/uploads/files/202109130251367895.pdf
    • http://baove247.org/upload/files/29853638885.pdf
    • http://oldadmin.k12cart.com/media/files/bisifatigawu.pdf
    • http://tscyw.net/userfiles/file/20210917090304_vppwln.pdf
    • http://dges.in/userfiles/file/88989828421.pdf
    • http://zoo-foto.cz/userfiles/file/50486286440.pdf
    • http://kystar.net/filespath/files/20210910231257.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/wifanadano.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cara+kirim+file+lewat+bluetooth+iphone
    • 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_off0000afc9.bin
d41ac6a2eedd8c76d62ba28f6a723a062c9716714383ec2e8119dfb1e6c06898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 14048 bytes
font_01_sfnt_off0000d26d.bin
c05918560d490ed4c8255ff8aa413485f8a2418a06be0d469d6d2b31824e0cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 10904 bytes
font_02_sfnt_off0000eb4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16792 bytes

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