Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5c350c68d0135d…

MALICIOUS

PDF

100.7 KB Created: 2021-02-16 19:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9c2f3424a07a223b7ef1bc096fd55c95 SHA-1: fc469a7be87dc7a455eb9da6afe5009cc10168fd SHA-256: 2a5c350c68d0135da0954e2621d331c04853fef9fe02c039d63bb3c607f56a52
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. One prominent link, 'https://jacksth.ru/strik?utm_term=shadows+of+brimstone+forbidden+fortress+adventure+book', appears to be a lure for a specific book title, directing users to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=shadows+of+brimstone+forbidden+fortress+adventure+book PDF link annotation
    • http://montana-media.com/english_christian_songs_audio_free1kbei.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/ddab6403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_600f3c9db3690.pdfIn PDF document text
    • http://50off.pro/180164689581a467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5feb99f05f556.pdfIn PDF document text
    • http://womans30planet.com/facebook_lite_update_appspu2vu.pdfIn PDF document text
    • http://leftoutclub.com/pezunutajegulumuluwufobdhr5q.pdfIn PDF document text
    • http://blog-millionaire.buzz/what_makes_you_not_a_buddhistz45j5.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/z_nation_cast_season_3_episode_1155673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd1601fe7976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/fgo_summer_event_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/nexaxesogizewisovovepewep.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/clothes_design_mannequin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/35142452573.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dudajabufagozimapopoj.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 5572 bytes
SHA-256: 3f1bc338853cbecb69e950a8fedc1d28b71da5c70b5f92549ce8c9a160951f59
font_01_sfnt_off00015bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFC 11352 bytes
SHA-256: 9ec7950f8a45c8e9116ead31d855287c8231acc5dbafa31a7a3a9cf65970b8cc

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