Malicious PDF — malware analysis report

Static analysis result for SHA-256 269f90ec5ca9d14a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-12 21:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 138d247cfac0b5a6e60b224bafbd7f75 SHA-1: 952c6e60177f747b848789480fad47b5dc46e4dd SHA-256: 269f90ec5ca9d14a046ee2a61630eb18d2afc5aa79ab8d50890e37a25acae8d5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing attempt to redirect users to a potentially malicious site. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3975

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/pL_UGxDroB4/square?utm_term=c+program+to+reverse+a+string+using+function
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9528af229ba2ea838753e/1625903754650/17330565425.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8939e64ce5371635621c/1626114362033/right_humerus_pain_icd_10.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec789d7e2b6271615a4f7e/1626110110118/mabumiwinanidupupabug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3de.bin
63ffce3e601ca213fea9bff03c01ba9aa3470600d44d4a182375b93e2bc90b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 16564 bytes
font_01_sfnt_off0000ef5b.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16344 bytes
font_02_sfnt_off00010555.bin
fe52235e2a748f23e97cafcbff550da9d7ebbaab9db5f8509565055fde280bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10976 bytes
font_03_sfnt_off00011eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 16792 bytes

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