Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc20c774956656cc…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 01:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0f2ca50d718f5a5655c957ba2253e4f SHA-1: 3fefbefd3317772c937e3035cb53354d1c9c7a99 SHA-256: bc20c774956656cc0226d699e151a629cc1f360316ad80a480df2ce7b43b3cf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous embedded URLs, many on disposable hosting, suggest a phishing or malware distribution campaign. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=gmo+foods+meaning
    • http://dastone.ru/userfiles/file/81124157939.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/30583901512.pdf
    • http://livestocktool.com/d/files/xopetojidodogepalet.pdf
    • https://pnvvr.ro/userfiles/file/vasajejoxajazofekizikozu.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/88150633821.pdf
    • http://www.farimar.pt/imgs/uploads/45324390629.pdf
    • http://choragwica.pl/userfiles/file/21559012515.pdf
    • http://kartinatv.org/uploads/files/68532417967.pdf
    • http://autoservizimensi.it/images/fck/file/kamivuradavu.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/47555950752.pdf
    • http://architetturaurbanistica.it/userfiles/files/dezusololetijuvudiwufutev.pdf
    • https://unaizahic.com/Files/files/4432071373.pdf
    • http://mptech.vn/ckfinder/userfiles/files/58919238901.pdf
    • http://alburigiott.it/userfiles/files/bubowitavimuwutevu.pdf
    • http://locke-3c.tw/uploads/files/202109160256014645.pdf
    • http://aburobocon2019.mnb.mn/uploads/files/jofusemunimilobitojalo.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bexexagojabovemibalotad.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a21df37688---76022306252.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/26793768699.pdf
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdf
    • http://chanhungcorp.com/images/uploads/files/91384882357.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f83e8ad84---19982158694.pdf
    • http://bbdecontra.com/userfiles/files/77916893940.pdf
    • http://metrominicabs.com/survey/userfiles/files/xaxagolenofo.pdf
    • http://abwingstop.com/uploads/files/temepom.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_off0000b36d.bin
0985a3cf4f06fdc158873f4ac90436e1bb0b2d8fd5029a163b349e4cc0cbcec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 15604 bytes
font_01_sfnt_off0000db30.bin
150c22813560b517d2fc8871842ae0b3214fcd44c24672ea5567793f42e937b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10492 bytes
font_02_sfnt_off0000f2d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes

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