Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29e2cc06c2865ad…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 02:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca221e5de99e30e1a1604f396a7c4a12 SHA-1: d7c5e170a566c4b652aa34ae0bcc63e5e2a2006f SHA-256: c29e2cc06c2865adf3d41cc7ac532c430e305ab3c5f3f0b5519dd1c25ec52634
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on disposable domains, likely to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arbormaster.net/uploads/files/25922131807.pdf In PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/50358005774.pdfIn PDF document text
    • http://langmypham.com/luutru/files/zakuwodapiw.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/23617588661.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/210853407675.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/30755774514.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/12922178198.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/48965517323.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/58899668602.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/dotemulejaxuzevela.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/872fc8988ebf25483b643aaa099a4897/resagonefa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/limunem.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jepukatebemixubexet.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/30280420856.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109181113396642.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/junamemuj.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/devinoviladanowugujo.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/20577175357.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pisulamupenokenutepasi.pdfIn PDF document text
    • http://sentai.cc/data/file/20210920_210537_540.pdfIn PDF document text
    • http://nfc.soo.jp/file/zejibasijubikofoziso.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/efdc8c49bfa1ec0f2967bf77244c564a/tuvexut.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kisukenuvevatikos.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/gavuvigewabesagezen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=horizon+apk+downloadPDF 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_off0000ae8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 10216 bytes
SHA-256: ebb79fc1a5830a0e53591c7407d6bd254a8bf3de3d016e1fbfb5c28479654b25
font_02_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 15468 bytes
SHA-256: f453a28cf128bd41a3170bcb652d848fb14511cbdcccea7b453064f6e764fb6f

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