Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa0b083fba68af4…

MALICIOUS

PDF

96.6 KB Created: 2021-07-13 19:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38b3f2467d2bb01cde9f75cae190efae SHA-1: d6431527b198693827ff2d1cf3a4609d9e9f8586 SHA-256: aaa0b083fba68af44a5258ca8c8e55b0e67a243e2d2e35ba1551e2660d9c7b85
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 heuristic firing for ClamAV detection. An external URI pointing to 'smidgel.ru' was extracted, which is highly suspicious. Although no document body or script content was directly readable, the presence of a malicious URL strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8343

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://smidgel.ru/square?utm_term=hahnemann+laboratory+products
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92449566ded7d61acd9a7/1625891914017/family_praying_together.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed67dc39532c3941c08102/1626171357174/kesesaziramuzeninokanegu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec9de497282d6f4692c9cb/1626119653032/tijapixinaro.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8a7313c197e145b25b701/1625859889299/consulate_meaning_in_tamil.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec91907dc7460dd09becd0/1626116496852/xoxilaruworopimupi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e5ae7718717d762d0c0/1626115674549/melody_of_troubadour_music.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_off000113d9.bin
67fe2c2b3a5ee318a6ca7883bdc66d338156d79251c6e9073f0790fb7a7ea98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 18568 bytes
font_01_sfnt_off0001453b.bin
eb8958f02ad8f85931aad9f958a7d0de9195fa770c76ec526cfdc3ed79379cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 11032 bytes
font_02_sfnt_off00015e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E75 16792 bytes

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