Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd9018ef3f3f9e5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 502653ebe64026107e4eb9c1c6c7db8a SHA-1: 081443e39da4e5409501b2a9a3f235eeaf55e1ae SHA-256: fcd9018ef3f3f9e5aa33ab36b8f803ecde1463ebd5089c914945dffd741d5f5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://timavoshipsupply.it/userfiles/file/31271680486.pdf
    • http://zjgyuanhong.com/v15/Upload/file/20219161834452259.pdf
    • http://fanti-fitness.pl/uploads/assets/file/pusugidowuvesex.pdf
    • http://universalestetic.com/userfiles/file/matuniburedi.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/gunuzarefalurokuwopu.pdf
    • https://congtydaihai.com/upload/files/71800330285.pdf
    • http://techbis.pl/files/file/53194779164.pdf
    • http://cottoneauto.it/userfiles/files/95908576702.pdf
    • http://busangh.com/attfile/fckimg/file///2021091414598_1054596734.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/misoxazebugabenipowilo.pdf
    • http://fpempresa.cen.es/userfiles/files/93392513627.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/97798949010.pdf
    • http://simoncaulkin.com/images/3854690453.pdf
    • https://takarasushimn.com/userfiles/files/42472284450.pdf
    • https://publicbridge.pl/userfiles/file/vebadofizagiwuzex.pdf
    • http://jfac.kr/ckfinder/userfiles/files/47016009703.pdf
    • http://chuanghuilaw.com/filespath/files/20210920055146.pdf
    • http://bjdfszwy.com/filespath/files/20210917154753.pdf
    • http://berbun.com/user_img/file/14324639602.pdf
    • http://cokhitienvuong.com/uploads/files/13651587890.pdf
    • https://novahealthclinic.ca/userfiles/file/bekasonewolimasemed.pdf
    • http://chromowane.com/userfiles/file/duxebe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+movie+streaming+sites+no+sign+up
    • 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_off0000e1c6.bin
f1262668e0920fc7f3c2ac9e892c6d4942c121dbf1267b0e8b7dbb79815addff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10692 bytes
font_01_sfnt_off0000fa50.bin
f1ef591a0ff0e0fe92a820c283d9344e90202d17bba988a77d166ec3cf443dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 17256 bytes
font_02_sfnt_off000126e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes

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