Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0e67a8834d57e7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 12:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11fb528ed76de45c92a35ededd553b6b SHA-1: 62357c5717cd9ca7b9e84dc59c5c566ed90986d7 SHA-256: 6b0e67a8834d57e7f15c6e784c99fa3036a575abdad2aa696b3307cb10757e26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The embedded URLs, though many are marked as benign, point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ideviceplus.be/app/webroot/files/userfiles/files/37857119810.pdf
    • https://aawyx.com/sites/default/imageuser/file/73379907907.pdf
    • http://homearcky.nl/userfiles/file/13168021849.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/girubutevetudaxebirofak.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/48727699927.pdf
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdf
    • http://ourgans.org/userfiles/files/velifazelanimazedodejot.pdf
    • http://altadirezione-consulting.it/userfiles/files/pazurore.pdf
    • http://wish-pharma.com/upload/files/repefit.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d34913e67cd9d188b49ac533e36fb8f/98220871637.pdf
    • http://77owship.netsociality.com/upload/files/32922350435.pdf
    • http://zs-oilfieldequip.ru/d/files/mewaxipifewibaninuvel.pdf
    • http://sin-hua.org/userfiles/mimabajakafuwol.pdf
    • http://bociany.sk/media/file/sifaminewokikotef.pdf
    • http://franceplus.fr/userfiles/file/44400613902.pdf
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdf
    • http://mirutte.com/newsfiles/files/vegivale.pdf
    • http://anapro.com/ckfinder/userfiles/files/27910638286.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/vilarufejirajaw.pdf
    • https://liur-krd.ru/userfiles/file/70256087788.pdf
    • http://www.jindatunnel.com/up_files/file/kudezapage.pdf
    • http://mebelhotel.ru/userfiles/files/812967408.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/82362443727.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apk+editor+online+pc
    • http://s250801404.onlinehome.fr/img/uploaded/file/35022550507.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_off0000dd73.bin
407fd0efe836baf3a8874cf137a1784d0cdf0020872faa9a64ea19ddbc5a42d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 17376 bytes
font_01_sfnt_off00010ae8.bin
1c4c27bd6f1b05e7290aa00ad56446e8563cbe77c6d2481daf65bbdf8cc34094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 10252 bytes
font_02_sfnt_off0001220a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes

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