Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a820bc807b32133…

MALICIOUS

PDF

88.8 KB Created: 2021-07-17 05:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6e0f5e45718790b65764019f3274229 SHA-1: dd7dc1c409ff9585d272babc44226ff2b3ba9305 SHA-256: 4a820bc807b3213396c2afd96b6f49bb6848fe8cf379925de4945921970d1cf2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV detection and the presence of an embedded URL strongly suggest malicious intent, likely phishing or malware delivery. Although the document body is heavily obfuscated and unreadable, the embedded URL points to a resource that could host malicious content. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier clean score 0.0819

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://feedproxy.google.com/~r/razvivatel/yapz/~3/pL_UGxDroB4/square?utm_term=cancers+of+the+immune+system
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fc09c91b61347ea21af1/1625881609724/42208217482.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edbb0f5017b3622aed1bb4/1626192656145/john_fogerty_have_you_seen_the_rain.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16792 bytes
font_01_sfnt_off00010b92.bin
fce5b8ed95d5fee3416a8cc26465f44b0b92a64b402f2d2f60b84ee108142de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 15824 bytes
font_02_sfnt_off00013462.bin
26d1045d573a67dd53358b2e0a23792e20855dc1c7c09de54ef4132e44e48006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 10800 bytes
font_03_sfnt_off00014d22.bin
ae4fe97bd3d6c12e06377c99d9517d573f2708a09b5395482dda99e510844c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D22 2264 bytes

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