Malicious PDF — malware analysis report

Static analysis result for SHA-256 3238b366e44728f8…

MALICIOUS

PDF

111.4 KB Created: 2021-07-21 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40b3d27832787dbfb536168ce224cc62 SHA-1: 12d9b5a7a762e93c27ff403595e65e11117ccb25 SHA-256: 3238b366e44728f82923db4cc4e0e7eb692146f88205081443f03e920d842380
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains an embedded URI pointing to the suspicious domain 'archism.ru', likely a phishing lure. The file's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7979

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://archism.ru/square?utm_term=ethnic+groups+in+luzon
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5f2b462f394a1e447ec6/1626234667674/the_chaser_short_story.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee2efa8e3fff2bd3bf8074/1626222330088/benunoxedazawejemexofi.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f43da1ac77840235740da7/1626619297238/diaphragm_and_spermicide.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e78d9a81ab8d1aa9da41d1/1625787802139/epiglottis_and_its_function.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1b04dbe9e662a9c1e7fda/1626452045324/how_to_say_gnocchi.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee08292485902f3e6ef5b6/1626212393435/the_caged_flower_full_movie.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91d1f1448b06198485919/1625890079456/parallel_and_perpendicular_graphs.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_off00015201.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15201 16792 bytes
font_01_sfnt_off00016a13.bin
a29f17ab5bbf1d5326cf3e4d1386e96f1394a3ecc9bc50c0b515e357886ad307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A13 18420 bytes
font_02_sfnt_off00019a21.bin
92440f65ec57015d0db955705c2d716dc72425f4e1a13ddcb35fd3db5e3a077b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A21 10504 bytes

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