Malicious PDF — malware analysis report

Static analysis result for SHA-256 8438c301480963cc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 08:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57fbd2cb72c901ff3f5055faa57d5c55 SHA-1: df99ff5de4378c2b1fdbb886ded431b1855fead1 SHA-256: 8438c301480963ccfecaa3f2cd3b0c36e300040e72b850fe3b51591e67d588ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as a link farm designed for SEO manipulation, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=pokecoins+generator+no+human+verification+2020
    • http://vitajeans.com/ckfinder/userfiles/files/bevisat.pdf
    • https://tipresentoio.it/images/file/xuwobowanivosemubara.pdf
    • http://dejede.com/userfiles/file/59952459741.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/9952579233.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bevuxinameparemu.pdf
    • https://guijek.com/userfiles/file/gakewe.pdf
    • http://wjcopy.com/upload/files/49670828660.pdf
    • https://mimpiindah88.com/contents/files/92733694774.pdf
    • https://zagi.hr/files/xafelokomufezos.pdf
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/fegolevubulevij.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912c1da24e---doziletufazofaveg.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32540622077.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/41d6bd2548a96daf2a0d3729341845d1/zigerupinakafofujujadav.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/xokusuworipoveguvitu.pdf
    • https://turbooto.vn/upload/files/8393801769.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/34493570988.pdf
    • http://dainindo.com/Uploads/userfiles/files/nizekebodekax.pdf
    • http://topflexsports.com/uploads/wewedidinapejojanafej.pdf
    • https://kokomanis.com/contents/files/24649173109.pdf
    • http://rogersdesignhouse.com/uploads/files/25782867487.pdf
    • http://chipgene.com/image/files/20210902_192438.pdf
    • http://hoachathoanggia.com/userfiles/file/fuxatuvujobibe.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_off0000b52d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 16792 bytes
font_01_sfnt_off0000cd3f.bin
318204a9ba9f152daed14493cb808a48c970d1c64fba5c6140964a6ab2390819		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16544 bytes
font_02_sfnt_off0000f809.bin
c00d8b7f87d2ac09b466f27a0f29d49109dae23e3e63c2bc06026790cf47ac41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11236 bytes

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