Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4259778199cd885…

MALICIOUS

PDF

84.4 KB Created: 2021-07-16 19:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6767495ea91df5a79fa41cf6be54d3f6 SHA-1: 2827ec486441e707b8435840e7e0f1c1d998a587 SHA-256: d4259778199cd88596a57c6e35d3c7ea1e009c763157d3d809d84f5ff26a252d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded external URI pointing to 'allytemp.ru', which is highly suspicious. The PDF structure itself shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection or embed malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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://allytemp.ru/square?utm_term=introduce+yourself+in+interview+as+a+fresher
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0ae5e017ecb2946497c9d/1626386014462/merogager.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e79f9323621b4743e0c297/1625792403882/low_internal_validity.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee81c2e03b615e0991db1b/1626243522636/74208818733.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1b4640bffd73330190b78/1626453092929/23945158653.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0a975b2f3fd7b937a5a25/1626384757698/download_totally_reliable_delivery_service_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84a.bin
ff1957b839e6e1a9aae868a2f8407fb1c3e209f3f9100be5ffab9454c2458cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 16992 bytes
font_01_sfnt_off00011432.bin
ef2f58c102304e2ca7e582c5d4640de3bc8c13058d74faa39ca3922f42bfbaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 10892 bytes
font_02_sfnt_off00012d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16792 bytes

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