Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa475286aad3027…

MALICIOUS

PDF

72.6 KB Created: 2021-10-23 09:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3288baf45adf86e11269abfd852c7c70 SHA-1: 95acd8e52eb0ffea7d2738a07850f2fed3823320 SHA-256: 7fa475286aad3027514085701151000f3220a8a4685b56c9de0b43b820185580
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on potentially suspicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://maidichike.com/upload/files/43855781158.pdf In PDF document text
    • http://ecilingirler.com/resimler/files/36505304736.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/29478246115.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/xekubeji.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/89212489558.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/82530273634.pdfIn PDF document text
    • https://siroyensao.com/upload/files/futexidafogulumo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/wowujodiz.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/binuponotubojebeburu.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/46418545806.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/12749602476.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/boluxopurokibole.pdfIn PDF document text
    • http://kosma-damian.ru/userfiles/file/buruxatafe.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/gatogupaxidu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/57d4f979585eac27ec889255391176db/wakiw.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/tuzajituv.pdfIn PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/kifoju.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/kopiwig.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/tosetedotosamawewenabuwe.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/girupasuwedujajukosuj.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/21152298749.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/14176501110.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=one+night+at+flumpty%27s+2+mobilePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 11236 bytes
SHA-256: 3100e76c4615d93ab5a54eb20b889882dd4d119582b9bed6108cd8247d9537a0
font_02_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 16920 bytes
SHA-256: cabcc8c2269a8aa530edd5dff2ea32b7f17a18fdcd1976fb699a33c544ec7c8f

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