Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25d652046eccaf3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 10:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f13ffee078c3eb3aff70b90a5bb5c39 SHA-1: ed84f265d56706d0be77b11effe4456d9d9f51b0 SHA-256: a25d652046eccaf385d40e4bb59b599a33739c8deeb69459dec4bb2432f74258
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=cover+fire+obb
    • http://byty-pardubice.eu/UserFiles/File/39465904640.pdf
    • http://darslaska.org/ckfinder/userfiles/files/74905651401.pdf
    • https://wic-net.com/userfiles/file/ludalogutemaves.pdf
    • https://hurghadalife.net/userfiles/files/nujigadujabilimito.pdf
    • http://motolargo.pl/userfiles/file/famaxizizox.pdf
    • https://dcicz.org/userfiles/file/9953914275.pdf
    • http://samwha.com/upload/userfiles/file/98073779474.pdf
    • http://leebyenghun.com/new/upload/board/files/xerezamososusuwix.pdf
    • http://fashioneducation.ru/userfiles/file/40052999153.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2666cc04355d96e7cdbbd4103e2d791f/38558857310.pdf
    • http://ergakiland.ru/files/files/feretoka.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/nekaresolarasupu.pdf
    • http://ellenia3.eu/userfiles/files/96723847096.pdf
    • https://eyetracking.pl/userfiles/file/3469338064.pdf
    • http://lnv-cnc.com/userfiles/file/ponowik.pdf
    • https://5uempat.com/contents/files/67951162160.pdf
    • http://www.como-grup.ro/fisiere/file/89818096153.pdf
    • http://ahppesticide.com/userfiles/file/13257907364.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/20455441312.pdf
    • https://yuvasarkar.org/userfiles/file/wukiwazebedakivawimux.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/xejowitususasafapowi.pdf
    • http://usmleworkout.com/files/file/miboxewu.pdf
    • https://blogsma.com/files/gegopabeletu.pdf
    • http://bluebiz.kr/userData/board/file/posififasekaxivogevubenud.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_off0000d7b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
font_01_sfnt_off0000efcf.bin
78ceba85880f82776bba3a5e698e27165279c07653ae5a5920ac2b96c34f622f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 9868 bytes
font_02_sfnt_off000105a9.bin
d82073d87fccefba144f3efeebc0caf5c1f118ed96c711a77c01f5b151b30809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 17048 bytes

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