Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8988ed81bb83be…

MALICIOUS

PDF

78.4 KB Created: 2021-07-19 18:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dd639308279a7bc9f1f2a930dc1bd36 SHA-1: 3e802ee3cefc825d64afbf7659de826c0c664eeb SHA-256: 8c8988ed81bb83be6b858ee198bb38953a26dc2c1ef2d7dc77999675f41a9379
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded URLs, though currently classified as benign, suggests an attempt to redirect users. The file's structure and detection patterns align with common phishing lures distributed via email attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UZrB20b2Dcg/square?utm_term=itchy+inside+vag
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f4a449a9adb72803b5a5d0/1626645577734/planning_a_software_project_in_software_engineering.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3bcf7860d895b482c7cfa/1626586359597/9964747774.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee58ab537273346e319588/1626233003287/iso_27002_free_download.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee4611fb3cc800db560264/1626228241640/personification_in_the_village_blacksmith.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edcf71a50f6e33a32292a8/1626197873598/72657288218.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_off0000d4e2.bin
74e51300a0689aecdde7b8bf3dc73818674a5fc26840ab1072395aeb40d74ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 16136 bytes
font_01_sfnt_off0000fe8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 16792 bytes
font_02_sfnt_off000116a6.bin
211e13102184050199afa3ab1ab435620787428d1d9717e3fd289a622cd5dd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 10512 bytes

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