Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6597fef64177083…

MALICIOUS

PDF

75.7 KB Created: 2021-07-13 17:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36edc5f44ee5e1822c6380451552d632 SHA-1: 4bd1c82b73d4a1db2ce506fca7adee149fe63be8 SHA-256: c6597fef64177083721c50af7373df6e68143d1db81c19cd298331011f4346aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://philabc.ru/square?utm_term=farting+in+bed+funny+video', which is likely a phishing or malware distribution site. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://philabc.ru/square?utm_term=farting+in+bed+funny+video
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e83ad6f0b0395a876eca5b/1625832150914/validity_and_reliability_ppt.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed37403b21860fe66ebc5e/1626158912856/rafter_roof_framing.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8e712271a75a72d4de4b/1626181234162/28153725462.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e943e12210ba6bce1337b5/1625900001623/green_power_sources.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e93bcce370ac632289bfef/1625897932879/broadcast_the_net.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7e013b977dd1475ca47d7/1625808915557/types_of_jobs_that_pay_well.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_off0000c803.bin
aea44f5db26f2911d742badaa1babe0109cf21535a28a02604d6fbb1d9e1a41c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 16484 bytes
font_01_sfnt_off0000f29a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
font_02_sfnt_off00010ab1.bin
fc5723e4154d51557401b2f9ebb069dc02f41f0ed19405ab0540630b5bb9fd84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10712 bytes

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