Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6f1d4161f7f9af…

MALICIOUS

PDF

72.1 KB Created: 2021-10-07 23:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 28158191b6c3d4237fad53feefc6a9b8 SHA-1: 408c9bd5170cbc0c4b587c6740b3ea2c5ba5a98a SHA-256: ab6f1d4161f7f9af552e3437fa4af69c13a6e1796d760c5aa1af0ad33f2679f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

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 https://drafthe.ru/uplcv?utm_term=how+does+absolute+dating+differ+from+relative+dating PDF link annotation
    • http://hondatayho.vn/images/ckeditor/files/94980698456.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/7732777766.pdfIn PDF document text
    • http://aven.su/userfiles/file/jasuv.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/77854330352.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m4ap51gtdh2mtjdpc27g9br19r/76377988879.pdfIn PDF document text
    • http://domuran.pl/files/file/gofitedelep.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/nelimebixe.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/rexutiwadafamajifonos.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/somolivatiwudot.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/92471085444.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/12577161116.pdfIn PDF document text
    • http://crm333.com/documentos/file/42376847841.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/siralowufidijugujiwise.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/mavoku.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/72002805574.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/8122953127.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/23940054300.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/15125384444.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/51946610168.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/90949172880.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/genek.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/noxaxuf.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_off0000b85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85C 15828 bytes
SHA-256: bef2df7f2c2a3ec9e2658c2a9765c02353a0a86876d9ca085ff7776f835c354e
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 11080 bytes
SHA-256: dcbad1d8bdb5b342d3500e52abb12f7ff3b1b2a82f93540e5ef8ce56b7f8daad

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