Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87750d5cde62fab…

MALICIOUS

PDF

80.5 KB Created: 2021-07-18 01:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b677578f4b27bad0d1b86b959306049 SHA-1: 725c0957c15fe0434a2f85fe0a564b421ad2cdba SHA-256: e87750d5cde62fab9abd654b5e1926d13b0a183c57ce69de9d67da93ddf30283
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The heuristic firings indicate the presence of external URIs and embedded URLs within the document, likely used for a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5793

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/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=methodology+in+research+paper
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e91233cc7c086459264e8a/1625887283836/seven_nation_army_tutorial.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee7c53ab0cb8743be82461/1626242131204/open_faced_roast_beef_and_gravy.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ece733b1b13d3c3c0a80ef/1626138419455/rexumefafe.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f7022dabf27235526866/1625880322836/unsecure_online.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_off0000dba7.bin
c79030082665c3d71e5d049828be57b56d2e164299b88aa8bc329b2cd28a0bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 16208 bytes
font_01_sfnt_off0001057c.bin
e85b55d6198009ef761b7ee0b8e75debd3d71e42529458d94145bca68dcfce4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 10900 bytes
font_02_sfnt_off00011e80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes

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