Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc3ab03c529847a…

MALICIOUS

PDF

75.9 KB Created: 2021-07-17 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3f2ba4d91b57f7666732f648374729a SHA-1: 856dfeb8da6fe7d06e44d53e612e69d6171be8be SHA-256: 7fc3ab03c529847a52be22dcb0dea1dd75e14db1604f47ec2c55c2630d240d86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that points to a resource that appears to be a lure for downloading PDF conversion software, likely a pretext to deliver a malicious payload. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/um1bUVUAM38/square?utm_term=pdf+to+all+converter+software+free+download
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0112c24fa75375d85b7ef/1626345772242/lixafilinasobina.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f26c0781f38b20587d6465/1626500103304/how_to_re_save_as_smaller_file.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e843c0ab279f21c75d9fb8/1625834432169/waxobezejuweniporusu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eca4a31996685841abcf2f/1626121379741/90978442198.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e92079b630645a0ef75e08/1625890937355/bezipaburogapaxazevuzif.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_off0000c83a.bin
0bc2ca2e44744d2d9b60e7005acf17ac4736a5bd114b412e1d2f9b3b2e64d2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16056 bytes
font_01_sfnt_off0000f1a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
font_02_sfnt_off000109bf.bin
173082635d0f2a84d539dda1d97ef67b77f060b32885ceab07b30c87550c5d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10532 bytes

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