Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded98cb0fae84f6d…

MALICIOUS

PDF

80.0 KB Created: 2021-07-13 16:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e480dc3bdbda993386176daafcaf8a6d SHA-1: e0424d2e59310a96a776a209bce95cbd41b0f59b SHA-256: ded98cb0fae84f6d4e7bd5eef9c88ad589f9805e6f931dd4acb5c952c1d8d3bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Although no readable document body was extracted, the presence of embedded URLs and the PDF structure suggest it is designed to lure users into clicking malicious links or downloading further payloads. The PDF_URI heuristic indicates an external URI was found, likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/sq/ugae/~3/AG-UZpNbJGc/square?utm_term=cpp+shared+pointer
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7cd5ff9c8b53cea1c2cd/1626111189236/woods_astronomical_timer_instructions.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecc3896230952f42cf62fb/1626129290055/16720991806.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8f6d42210ba6bce106bbb/1625880276619/butterfly_song_download_mp4.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec85c00d838b6c850d24b4/1626113472168/life_skills_questions_and_answers.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_off0000d86d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16792 bytes
font_01_sfnt_off0000f07f.bin
39e68beaa5013f0a09d8765babc7c8ff9c71563b7c6211e5d2113e8ba7d99799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16872 bytes
font_02_sfnt_off00011ce6.bin
6bfaf5565cf89fe321d27c40fd10a3132a8e415954a8985a7000979a4b3325f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 10476 bytes

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