Malicious PDF — malware analysis report

Static analysis result for SHA-256 de85afdae4f1f8d2…

MALICIOUS

PDF

71.4 KB Created: 2021-07-15 10:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 437357225ba81d270067cdb56c667438 SHA-1: eae5f29988458b7d1576723398936afc74752e8a SHA-256: de85afdae4f1f8d2fd92e8a98313f8af433f138b86f3530083c71625e25b8f4c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to download content. While the document body is heavily obfuscated, the heuristics and embedded URLs indicate a phishing attempt, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.2209

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
  • 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://feedproxy.google.com/~r/sq/ugae/~3/UQ8tT55rDuk/square?utm_term=w+tracing+worksheet PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60efd6f50511021e70b3a413/1626330869148/jafanirogejalefofa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9085f6fc466b5bf43ff2/1626116229905/song_wish_grandpas_never_died.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C8 10636 bytes
SHA-256: f278e053066b026aab5e516a9a9484a7ce930980944958cb08e4f43655963429
font_01_sfnt_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16084 bytes
SHA-256: edc9d155c4e6e90d750b42bf2f89ce094fb2dd83420cab46dde603aed65d00d4

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