Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc5d6abb2984b3e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-19 02:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 658b73aed121341239c7a57aa2008690 SHA-1: 520a4dbff8089ab35df7e66e143afbe50d1566b3 SHA-256: cfc5d6abb2984b3e1957dd551ba58e91c8d04cc7ac31d5ae033e55ff8e4e8e1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=what+is+the+largest+country+in+the+world+in+population PDF link annotation
    • http://delfosventures.eu/userfiles/files/56185610714.pdfIn PDF document text
    • http://119pump.net/d/files/foxuveko.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zusokitenojamu.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • http://ihappywash.com/uploads/files/202109181751187523.pdfIn PDF document text
    • http://masonhn.com/d/files/82117732990.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///49715039871.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/17656946664.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/dopufifupa.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/suzalozozenifopijiwunu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2132992d---45739457154.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/gudeka.pdfIn PDF document text
    • http://unityproductions.com/upload/files/redaf.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/nadekasefuz.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gupibikifurijajeko.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/39437154212.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/66954620814.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gejupisabarik.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/95073612936.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138df557bd6a---36558511060.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xixeradonufefizikore.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/34363327176.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/54413461487.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_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 11088 bytes
SHA-256: 451afe22bada84d2e41c216baaa51a29c3b0f035104e36e88f7c37136b6f1b9d
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 17596 bytes
SHA-256: 6dc3fd39182f57109322fcb9653c1b766afb90fbfd4822fc1921698f7212ab42

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