Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c85aa144e1c467c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 21:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecd710547c73190977ecbe08e8587677 SHA-1: 6f0c6b69123ac3932e652003c69a0a0582e87e16 SHA-256: 0c85aa144e1c467c53f1fa7b7bed36465168333fec3b307c4085d4fce3b483ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful sites for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy of using many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=most+expensive+game+on+play+store+in+india
    • http://www.ez4parcel.net/upfile/files/2021/09/05/28656640861.pdf
    • http://aloisiquadri.it/userfiles/files/10867263183.pdf
    • https://datenglagi.com/contents/files/tupopavapewuf.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec9fef55d---gaxexil.pdf
    • http://elitvorota.ru/f/file/xabaruwafifixun.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/13387129530.pdf
    • https://limadelimon.com/images/file/19912496474.pdf
    • http://costruzionibulagna.it/userfiles/files/vexomaritezuw.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/67782547020.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdf
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/wabesusaxi.pdf
    • http://imobilestore.de/userfiles/file/pipibapujinosakowegoze.pdf
    • http://vaynhe.com/upload/files/60594975961.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cc24nse8celm02llm2q8b18jr2/tomodixubolezabawexiz.pdf
    • http://rileyillustration.com/images/agency/files/pewugalefujigoberarirusup.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdf
    • http://laibros.com/ckeditor/userfiles/files/73889926254.pdf
    • https://niboparis.com/upload/fckeditor/files/99000144722.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/fewiwuwejakezume.pdf
    • https://buffinvestment.com/upload/ckfinder/files/89591198196.pdf
    • http://only-svet.ru/upload/files/21875903897.pdf
    • http://avvocato-callegaro.it/public/file/9459833892.pdf
    • https://healthmatters.me/userfiles/file/winebozudujup.pdf
    • http://biplano.eu/userfiles/files/78412836703.pdf
    • http://remaining-mc.de/userfiles/file/42198216522.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_off0000d060.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
font_01_sfnt_off0000e872.bin
841dd5ca9dde57c4561fee1f1e5512f7952dd6e5114369a491a9ac60d9d76475		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 16768 bytes
font_02_sfnt_off000113c8.bin
7325dcda62fc82043c8812b93917b3f22c302c0dc08be86b51a1595f8dc5c1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 11008 bytes

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