Malicious PDF — malware analysis report

Static analysis result for SHA-256 24487e06b355328a…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 02:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b2c4029e5a003a6d435bd2ba06d5eb9f SHA-1: b3fd3217028fde85a0b86234ea432603512df8da SHA-256: 24487e06b355328a0577da2a625c394a39a7e5d12b14c110a1768f0abb225ffc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'Code alarm catx4 manual' and 'wkhtmltopdf', likely serving as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/wix?keyword=code+alarm+catx4+manual PDF link annotation
    • https://cdn.sqhk.co/bomunerafoju/eQ1agdU/three_kingdoms_mighty_super_hero_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ff693296e931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd379f2469ce.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/nPbghKJ/mlb_postseason_bracket_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/negixakozaxu/jUjcgec/refafalotapam.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/idTTsgj/zombie_objective_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497685/normal_5fe09abd0d13f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5fe18533c1356.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/b1b0aabb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_6028065bd0c04.pdfIn PDF document text
    • http://simultaneously.space/old_town_road_ukulele_tutorial99ebk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 4968 bytes
SHA-256: f6e0672512bca20167e21c9c067c45bb78e8d6a00e733477f034023b1ce2e69f
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10016 bytes
SHA-256: 3ebd58ae960027300261a3ee60d5598294943445a01936bad3ef95ae693df8d7

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