Malicious PDF — malware analysis report

Static analysis result for SHA-256 823490a2e55f8e45…

MALICIOUS

PDF

81.1 KB Created: 2021-07-18 08:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ffe7301d0b8ec20e7003ecf5953b347 SHA-1: eae3136ffb2956a8d3c08d9c4666ddf6a910cbbe SHA-256: 823490a2e55f8e450bdaa3e5c33246d4d6a4001356a67b97543a5dbd01330da8
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identifying it as a phishing trojan. The presence of embedded URIs, though marked as benign, suggests an attempt to redirect the user. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9473

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=work+hikes+daily+themed+crossword
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1255b4bb49071de197986/1626416475779/grass_hay_in_tagalog.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f056333ab9101ab6a57f4d/1626363443339/impermanence_of_all_things.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed278af95b5524f950860d/1626154890844/gidira.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3a6b97f94c710fbc9b542/1626580665290/environmental_management_systems.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efc9f2d777570416516648/1626327538724/boiler_feed_water_quality_standards.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f266f0783e880aac7635c7/1626498801102/sipizofikuvobajovi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee7510a005482cc159c500/1626240272700/vavopazesosakat.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e819b87e45264421fb21d5/1625823672997/fakifokorebefozixonulife.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_off0000de5f.bin
27391fcd2def26af6a456d0ade37c5061abbc2a87d085ff9d73036352f9b41cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10816 bytes
font_01_sfnt_off0000f773.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 16792 bytes
font_02_sfnt_off00010f85.bin
351d1b549e74a661316ccb6668a90a40efd30d9ffbd0b782d3a4008282d5397d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 15888 bytes

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