Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a80da388467ac8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 13:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 479efdbc95b9c24407e2cb803ac9d21e SHA-1: 0548a68747df75fb461bdf7935481f96aa000c93 SHA-256: f1a80da388467ac82c5ceb8eed944d0e3a7cbabbb6024a78128a8ccd8cc74ffb
134 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, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a false sense of urgency to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=red+hotstar+apk+download+link
    • http://sprinter-lab.ru/content/File/41908041915.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/53410020202.pdf
    • https://glearningsolutions.com/userfiles/files/16904359505.pdf
    • http://jpind.pl/userfiles/file/7095162685.pdf
    • http://findusafranchise.com/files/files/dibebipo.pdf
    • http://clingac.es/d/files/34833524640.pdf
    • http://casadiriposomarsala.it/userfiles/files/78852589640.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/490145699.pdf
    • http://profil-metall.de/content/uploads/file/15553772173.pdf
    • https://tempatpasang.com/contents/files/gafigotidovegibeb.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/87889496555.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/riruvan.pdf
    • http://suaups.net/userfiles/file/15538297190.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2bc7c47b84134588444f1f8ffea39963/boxagenifesatujevoxibo.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kuzekefa.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/85555936620.pdf
    • http://speckrepej.com/upload/file/sawawomu.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/sinidemefiretuv.pdf
    • http://nandishoverseas.com/UserFiles/File/93566413524.pdf
    • https://mr-alian.com/upload/ckfinder/files/127228669.pdf
    • http://specialcats.nl/media/files/54446011487.pdf
    • http://bekkercoon.ru/ckfinder/userfiles/files/61125238234.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_off0000c117.bin
5e09637d5aecb0982322e9fc4d140b89d29d792a1f7fff4f4a0c9580c96baad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 17248 bytes
font_01_sfnt_off0000edc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
font_02_sfnt_off000105db.bin
eb1485094360e7ff27087e386c69c17b95dc949369202620d1d29b2b8eeb0e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10712 bytes

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