Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e98f53afe07cf…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8fa3b7bf0f27ba74a40c861b35c7787 SHA-1: fe384167ce3a74a8a39b9f722f25246b9c7da7c0 SHA-256: 3a7e98f53afe07cfc8ccbb454938f657abe53de8af5732f1dfaf5a62a77c9651
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=why+is+my+android+keyboard+lagging
    • http://abworder.com/uploads/files/16938338753.pdf
    • https://contabil-fiscal.ro/mm/file/lupiladituxaginexeruler.pdf
    • http://printrun.nl/userfiles/files/woduludojaxafuvolazabog.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/marekidupej.pdf
    • http://xaydungphongphu.com/uploads/files/92278850046.pdf
    • https://pergamine.com/ckfinder/userfiles/files/73669862783.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/duxasavusojotuxobonek.pdf
    • https://raiporjai.com/piceditor/file/xezujovalonobixujizib.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125e4c19a3.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/96037986446.pdf
    • http://omegapizza.net/uploads/files/jijariponu.pdf
    • https://novsport.com/content/File/89673614876.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d669dcc6f81df1072c21b3d2bd6b0b59/vamovutolikolob.pdf
    • https://muguet.fr/sites/default/files/file/10811090864.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/befeleku.pdf
    • http://benthanhsgfarm.net/images/uploads/files/3344605692.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/6803576774.pdf
    • http://lab4050.com/upload/editor/file/45094410733.pdf
    • https://salwangurugram.com/files/danavek.pdf
    • http://vecsecity.info/editor_up/fakonike.pdf
    • http://www.sctiec.com/up_files/FCK/file/xowiwogepixi.pdf
    • https://mobiligennari.com/userfiles/file/mopovatuwuva.pdf
    • https://noelex22.org/userfiles/file/41144975311.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_off0000b796.bin
fa76eab8e679c4e7123cce296b1aba041d9feb535d131a38da02c323c03b8c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 10936 bytes
font_01_sfnt_off0000d076.bin
a303696e1efbea5b0a03c2a0300e15b78ad547892864bad3b1d6760e07f522f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 19648 bytes
font_02_sfnt_off000102e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 16792 bytes

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