Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c2b253573bf7d7…

MALICIOUS

PDF

78.9 KB Created: 2021-07-16 19:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc420a03405979871ddb0f2e70bc6cc1 SHA-1: d5cbca9027ce56f43154be465ad2060aad1a9a68 SHA-256: a6c2b253573bf7d7f33d5003e2b81c9ba6ba35259917a9e860a5ed29eadfa8cc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The 'SE_URGENCY_LURE' heuristic suggests the document uses deceptive language to prompt user action. While the document body is heavily obfuscated and unreadable, the presence of an embedded URI points towards a potential phishing or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/AnJPYMJXbyQ/square?utm_term=2+bed+apartments
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eff7dd3015c64070c96aab/1626339293201/irs_form_1045_schedule_a.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8eeeb0cbdad4d3503b73d/1625878252090/passive_transport_in_a_sentence.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f16834f8313f2e5969191f/1626433588472/gk_quiz_for_kids_with_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_off0000d4c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 16792 bytes
font_01_sfnt_off0000ecd5.bin
7d1e4984f10fe0e72819a5789f9e3d72c00fae966ed028bfef705791ccb86bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16832 bytes
font_02_sfnt_off000118a8.bin
7ee35e853e06a7063f7d6e732920f34f01d44320af2fe93a4a6b57d624efc865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 10456 bytes

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