Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fa77fa1e6773b0…

MALICIOUS

PDF

76.4 KB Created: 2021-07-12 22:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ca19eb2d601ea3d6c45c8559c58a931 SHA-1: 657b3017b08f33ffc9849ef51e679bc5a78bdde2 SHA-256: b5fa77fa1e6773b04b01214c53dfd6afefbb0343a26e6f1ac4e8fa7dfb2a5311
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, specifically the one pointing to 'feedproxy.google.com', suggests an attempt to redirect the user to a potentially malicious site. Although no scripts were explicitly extracted, the PDF_URI heuristic indicates the presence of external links within the document, which is a common tactic for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its content, but the overall indicators point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/UZrB20b2Dcg/square?utm_term=house+of+wolves+game
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8edd73b7e7c63344da7a3/1625877975779/70428973218.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec91b7478ebe26bfc69bfa/1626116535313/motivational_words_for_girlfriend.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7ea546d117d6eeca4e3a4/1625811540879/zefobajaguzitugekomikaf.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7926f89f8e700bf66d8c/1626110247020/watenugezanapeminubebud.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_off0000ccd2.bin
712579ab85ad15edf5abd8de926808476aa2d963bade26c624f39f8af155f8f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16148 bytes
font_01_sfnt_off0000f6a0.bin
e9a4357fcac985e7e11325755dba3a6d0e0cb6565f89a10c229e56860c26280b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10408 bytes
font_02_sfnt_off00010e54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16792 bytes

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