Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2faa08ecde2ff5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 21:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24425766eeb8e0ade65e4397707f99fa SHA-1: 019e5f4af8a781d30196e9b523535e5e67419c34 SHA-256: 8c2faa08ecde2ff518fc5c5f5d50a86e4948626277be35057504f2bfcfe61046
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of redirecting users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=pc+suite+software+download
    • http://tupnate.com/ckfinder/userfiles/files/lasogemezosafozuxaw.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533e73c6c1---57772571094.pdf
    • https://fcksa.com/ckfinder/userfiles/files/13510235025.pdf
    • http://giasuminhtam.com/Images_upload/files/54950378486.pdf
    • http://headrepublic.pl/images/files/43618555933.pdf
    • http://homelife-superstars.com/image/files/85334109040.pdf
    • http://alvitraders.com/files/wawasonopavewepefajobafu.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/duwex.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131684b359af---zefeliwigelorivotiroluku.pdf
    • https://dgssu.com/upfolder/e/files/20210917200428.pdf
    • https://binhvi.com/upload/files/fewosepitafupukasalirer.pdf
    • http://gmart-express.com/demo/uploadpic/file/gitivekedemewo.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/pimudabiwumuguxejekix.pdf
    • http://zl369.net/userfiles/file/pajidadefox.pdf
    • https://alice-immo.com/userfiles/file/wobekiwebipevug.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/nebuxefotibonop.pdf
    • http://nexxstep.nl/userfiles/file/pegavavazolopaxogi.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/38510651723.pdf
    • https://spandoekland.nl/userfiles/file/68685857747.pdf
    • https://machinex-machines.com/UserFiles/File/vuvavagir.pdf
    • https://himalayanthailand.com/image/upload/File/19730945191.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_off0000f2ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 16792 bytes
font_01_sfnt_off00010ae5.bin
9c5dd32a227bb19837383237b0f0ba8980eabea4cc20d8887a10d9ca81e5d358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10656 bytes
font_02_sfnt_off00012384.bin
b456f5add30959610bd21d468b1188694fb92052724755886ce23b30ff74f7d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 18476 bytes

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