Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4d4d4a6521967c…

MALICIOUS

PDF

82.2 KB Created: 2021-07-16 19:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cab6ddea15a2a935765251c9e0b75b4a SHA-1: a5b6e7acb3e513833c6bb59248836583beef0185 SHA-256: 4c4d4d4a6521967cefe1ab80ff26f4e07af4b336f27a7c00e3f80c68a47f189a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to lure the user into a phishing or malware download site. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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://krisoc.ru/square?utm_term=anarchy+meaning+in+marathi
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edcae2ba7c7f743c1b1c57/1626196707562/closest_washateria_to_my_location.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f04ac5fca9d358620010ae/1626360518109/test_cleaver_manual.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e86855ea5c215caafb67b9/1625843797668/donkey_kong_country_2_rom_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1afffe884c975dcafb88f/1626451967631/muzova.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f11c1146c0d74f87de69e3/1626414097820/87694377336.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f173e6b238236d23360c5d/1626436582421/kajitinepak.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_off0000e1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 16792 bytes
font_01_sfnt_off0000f9fa.bin
d44464fdf1ed285fcb8a8ce6ffb5f669505c168b82ecb7056d2967969ff302ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10440 bytes
font_02_sfnt_off0001117b.bin
98b3424e300982ba3ad34e33bc57161709b5386774e07db15200fe5750cf4684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16772 bytes

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