Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c33cf66377a585b…

MALICIOUS

PDF

73.1 KB Created: 2021-07-16 13:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 300b7eec9000c7fd38765b15e5f1e6d1 SHA-1: 40f0ec46ed1f794fabf9c40bf060acca3d090c95 SHA-256: 8c33cf66377a585b8ff0dfcc3bc8a1de0a25413e093eab6b15ca31a18db01f05
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to external resources. The PDF structure itself is also flagged for duplicate object bodies, which can be used to hide malicious content. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious purposes like downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6403

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/sq/ugae/~3/iYdez4bKglI/square?utm_term=style+is+the+answer+to+everything
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edf8c5537dfa20040750e3/1626208454049/crochet_houndstooth_sweater.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecad2351a87c5d75afda8a/1626123555743/80570199143.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f1104cb238236d23321c00/1626411084480/for_and_on_behalf_of_meaning.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_off0000bd52.bin
dd2111c1d01fd7ee185e5182fdcc7970a69e9c09c4a56c2e4efc14af4933560b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 16608 bytes
font_01_sfnt_off0000e7e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 16792 bytes
font_02_sfnt_off00010000.bin
06c87d5144a74ee8069bf6586e0243195458519634637637c7cbd364595cabac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10728 bytes

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