Malicious PDF — malware analysis report

Static analysis result for SHA-256 67baae9bc35d2ed2…

MALICIOUS

PDF

88.6 KB Created: 2021-03-25 04:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82d3db127707ab47368e40d95d62aca SHA-1: 68c509ea3825604a921e4cfb3a34fc45ff732782 SHA-256: 67baae9bc35d2ed2fbbe2016d57ee6129beac3f6d019aa0d9573f524ea84336c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, https://golowaki.ru/wix?keyword=gunship+battle+3d+mod+apk+old+version, suggests a lure for users seeking game modifications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=gunship+battle+3d+mod+apk+old+version
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/6145033.pdf
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/dbb3ed.pdf
    • http://gavolav.mywebcommunity.org/kugafoxuliwiledades.pdf
    • http://geforiro.scienceontheweb.net/vemonilupas.pdf
    • http://kopogaxepaku.sportsontheweb.net/67532530348.pdf
    • https://cdn.sqhk.co/rolidofajug/Yiijln8/73146562082.pdf
    • http://difanitukovu.mywebcommunity.org/low_calcium_foods.pdf
    • https://cdn.sqhk.co/kekotenonaxu/gW4Z7id/ny_forward_safety_plan_template_filled_out.pdf
    • https://gesegalug.weebly.com/uploads/1/3/3/9/133999779/lasurimunore.pdf
    • http://ridaxaki.mywebcommunity.org/guitar_chords_chart_for_beginners_with_fingers_download.pdf
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/f4a3457a0.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/xusobigipaveder.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafirawit/46328724966.pdf
    • https://s3.amazonaws.com/salade/twitter_video_plugin_chrome.pdf
    • https://s3.amazonaws.com/kelukakeb/57014876222.pdf
    • https://s3.amazonaws.com/sefepugolupalax/lifoxunawexevefonimove.pdf
    • http://marivugedada.epizy.com/rukas.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/fanuxolololekobukowo.pdf
    • https://s3.amazonaws.com/xulepiwa/significant_figures_chemistry_worksheet_answers.pdf
    • https://s3.amazonaws.com/muvazi/toxonetelutajedu.pdf
    • http://koxowasone.epizy.com/behance_size_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd3.bin
6b85cf3d17ac7c6beded67b5460cb073a265e4a06f5933db20dda64bae33d755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 5660 bytes
font_01_sfnt_off00012ee4.bin
033b045f812fdfff9fcd9d068ddd95ac65e8bb0bdffd9b10430ad3e677830eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 11008 bytes

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