Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b568addbd41b2…

MALICIOUS

PDF

75.5 KB Created: 2021-02-21 18:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf3c811e59f4ae985b55176cbbede0e SHA-1: beeede081d9ec2d07fca812986cdcc66931a7b27 SHA-256: 623b568addbd41b24f8053d4c65c82709b1e7467ff05d8e57851a47552a897d6
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'scholarship award letter format', aligning with a phishing lure. The primary IOC is the external URL found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/wix?keyword=scholarship+award+letter+format
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fc9394d42156.pdf
    • https://cdn-cms.f-static.net/uploads/4482849/normal_601b26bd0baef.pdf
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60140b0e59298.pdf
    • https://static.s123-cdn-static.com/uploads/4465131/normal_600086bb9f2ef.pdf
    • https://cdn-cms.f-static.net/uploads/4387806/normal_601e22e378da1.pdf
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fd06bf1932fc.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6010704b390ba.pdf
    • https://cdn.sqhk.co/javukapegami/Dgcgcji/nhl_scores_today_tsn.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_602d0bcb4e2ce.pdf
    • http://togoxuruk.22web.org/jakopibakogepafunovevafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wupixufekijax/free_online_christmas_invitation_template.pdf
    • https://s3.amazonaws.com/gewisetug/naruto_shippuden_ultimate_ninja_storm_impact_apk.pdf
    • https://s3.amazonaws.com/donake/joel_2_12-18_biblia_latinoamericana.pdf
    • https://s3.amazonaws.com/dazifozixawus/acog_refines_fetal_heart_rate_monitoring_guidelines.pdf
    • http://luselobek.epizy.com/how_to_change_i12_tws_language.pdf
    • https://s3.amazonaws.com/befafuni/christmas_music_playlist.pdf
    • https://s3.amazonaws.com/vifusupegiza/74149811690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc81.bin
cb396a9ddc9994e1b067f09bc716da3402611ad3b651c0ad92f9f2b175dd57c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 5272 bytes
font_01_sfnt_off0000ee76.bin
64a873e51eb5f64b77144af6fd361280d0df92ee1b113b010f02aee14b3de053
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10752 bytes
font_02_sfnt_off00011327.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 4324 bytes