Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aea718ce0453a8…

MALICIOUS

PDF

72.4 KB Created: 2020-12-28 12:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8168f6224e9e81d3e6ca2fedf73031d SHA-1: 1ea2f25bdb215522ece9c6238166b9223d4e1d23 SHA-256: 65aea718ce0453a8fbf924bc9a8d13058393ead50c992319a193df1b8fd483f7
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, and ClamAV detection confirms it is a phishing trojan. The ML classifier also flagged it with high confidence. The document body, though partially corrupted, suggests a lure related to wallpapers, which is likely a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=dark+superhero+wallpapers+for+mobile
    • https://cdn.sqhk.co/pomijatan/auihjgy/wuwilixilisaramaf.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5f96964739769.pdf
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fd088cc56968.pdf
    • https://cdn.sqhk.co/sukurorezib/P7agfYc/managing_oneself_harvard_business_review_classics.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe93510c31a3.pdf
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fa4890cdb1e4.pdf
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f9f9461a443c.pdf
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fb9bd0ef2c8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tulosa/93224935057.pdf
    • https://s3.amazonaws.com/rolefosiju/rosejeg.pdf
    • https://s3.amazonaws.com/sisaxu/colliers_office_market_report.pdf
    • https://s3.amazonaws.com/bidemewufa/91400731998.pdf
    • https://s3.amazonaws.com/zuwosil/beyblade_burst_turbo_episode.pdf
    • https://s3.amazonaws.com/zizene/security_guard_training_topics.pdf
    • https://s3.amazonaws.com/dowavelaxam/long_distance_message_spell_5e.pdf
    • https://s3.amazonaws.com/rovikibixu/68611250133.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_off0000dc9e.bin
1680fd9f99cf535a8f2c1cdfea7bf1eff9e22cab8a70a7b134b1611929dbe04d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 5436 bytes
font_01_sfnt_off0000ef0d.bin
af8dcb0526d5040ec46646af4f7ce6aa4754f06b0be55b693af2efd1e8428ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 11696 bytes

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