Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffb4fc56776b14e…

MALICIOUS

PDF

75.5 KB Created: 2021-07-13 21:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3d7751be37e0c2f58f5008b5d572a8d SHA-1: a6e7fe535aaba473f3faf44111353b0803b5283c SHA-256: fffb4fc56776b14eb3e8f2153432fdcf7f8a9cec8d847b48dfb848e47fae7513
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URL that, while currently classified as benign, is indicative of a phishing or malware distribution attempt. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the presence of an embedded URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/qI_NY8u86tA/square?utm_term=sex+with+ai+robot PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9604fb9b95949b6609b08/1625907279914/pogexijarab.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7f707ba333063f1797b7b/1625814792008/452698701.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79b1c6d117d6eeca07df1/1625791260312/in_your_eyes_2014.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed6464f77a3e4a90f3fdd5/1626170469086/advanced_life_support_questions_and_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10288 bytes
SHA-256: 858e04a87776d6b229b61f83e189ed62c1c5ea149fa58a915c2d51a0fcae2a75
font_02_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16708 bytes
SHA-256: cfe5a9f72d86854289eb4a6a2e2f1eb25908a0beba3a20bf5ab3877c87602f42

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