Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc3988f50532496…

MALICIOUS

PDF

73.9 KB Created: 2021-07-14 05:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21c7cc50109e5e8e63befb1cfdeb8928 SHA-1: 5191e3b10d004beb720d667d26a3d8819e9e1815 SHA-256: cfc3988f5053249604fc98fe7a79e06dd42300c898db5deeaea1cdc79449b8ae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, suggesting it is designed to lure users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the malware detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7218

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/XMoLd4EPXkg/square?utm_term=i+was+in+hurry
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8f594f558d0bf39cae2c/1626115929394/how_to_build_a_hopper_in_minecraft.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f0600cbdad4d3503ce5f/1625878624487/my_in_swahili.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91a7b37da2614570de45a/1625889403395/vubofabivudorizonilaji.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed1939af55617121220321/1626151225382/university_physics_with_modern_physics_15th_edition_young_and_freedman.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_off0000bf92.bin
bbc665d7692674362331dc2e002957998d89d020689b6ae942f44c7403d9c4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 10060 bytes
font_01_sfnt_off0000d5da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
font_02_sfnt_off0000edec.bin
f2ac601c7d632d40b34568e6d6e20e02f5662c463efd76a56c5f27ec3ac3aeac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 17928 bytes

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