Malicious PDF — malware analysis report

Static analysis result for SHA-256 385e7f2306bc66ec…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 08:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 044f72080867de3cafa4a6a87429cd4b SHA-1: 8c0b5c0b9ada9503ba54928a174ee6295bcec947 SHA-256: 385e7f2306bc66ec2b57009d0b0a60902ca68ed13c56931527518348a8ba201b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=cost+of+speed+post+in+india PDF link annotation
    • https://birotex.rs/images/files/2650835409.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/22692489744.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/4185363652.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/44640102230.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lifozumategivusexepogagog.pdfIn PDF document text
    • https://koratspring.com/upload/file/97881168936.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/raretad.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jajiki.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/6327156068.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/27906279919.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/14869757982.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/32596390772.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d311fe327c---67314272579.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090711322053.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bugire.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/76514068765.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/zusuzitekit.pdfIn PDF document text
    • https://cicimanis.com/contents/files/ferudififuxaz.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/49700711372.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/bekabezop.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fb8df438f7d4c9b1f246490c76f1648b/64784301866.pdfIn PDF document text
    • 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_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10376 bytes
SHA-256: 06a89b41ab40d99a28c912899bedbc11cbb53247005cc913f76950e8485c4490
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 17892 bytes
SHA-256: 5436377678aa2b823fe344650cf34929cccbc441dec032f7bd3ffc52020d5ae6
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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