Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a892f476b73b60c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 15:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee013927b46ab98c934103bc598852c9 SHA-1: 4095f066eb10311308216d65462996d1679dfd5c SHA-256: 3a892f476b73b60c4a7ad9e8d89e9d41c7f93667626fd974ba9952024d73bf0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, pointing towards a phishing or scam attempt. The embedded JavaScript is likely responsible for the redirection to these external sites, serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onelove.cz/file/funekejosufofo.pdf In PDF document text
    • http://rhondachem.com/d/files/bujupar.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/gavemawefesipugumezusexo.pdfIn PDF document text
    • https://tch.lu/files/files/64341866876.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/rafazowetiremexoler.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/78878280212.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/68157867132.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/fupelujaboxosumiluno.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/nofawogimab.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67594427967.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mojomuse.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/bapidimuz.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/23133795404.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/1551197201.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/52541631634.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/97147168588.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109162338404873.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/jubemejun.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/56364972471.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bikot.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/duveboxumupelezolojogox.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/aef199ee035d2b4b97aafddf6a6af316/wilofobigumin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=retrofit+rxjava+kotlinPDF 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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10476 bytes
SHA-256: bec694861201b27a7a207326d7c9928f2cb7b0e84aa79d408bf3f0a0720117c3
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 19576 bytes
SHA-256: d9e920619af70cc5712290deaba0e797c9eeeb85bd53ae8e89c6b3c3fadec24e
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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