Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18bd1af5540a2cd…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 18:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6352835d456fd5f2bff33a470fded46 SHA-1: 40a668ba1d7fee71a7f7e4397f8096ce4f0c9d7a SHA-256: d18bd1af5540a2cd4357f37471a4ec6fd3eb1443388caf10e1178042f3035bb1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, while currently marked as benign, likely served as the initial lure. The PDF's structure and metadata suggest it was generated by wkhtmltopdf, a tool often used to create documents from web content, potentially for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

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/sq/ugae/~3/RVI1sXQGPkU/square?utm_term=questions+in+a+job+interview+and+answers
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e955c137cb90447561879c/1625904578033/5173985555.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f915cc7c086459253db4/1625880853223/75799890667.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed89a0c2b47a6141a48bf8/1626180000805/sovosazininig.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8f2cf4b4775d04a01fd4/1626115884368/nearer_my_god_to_thee_song.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed8d2aff6d86145ba1f02a/1626180907489/gibupazutozomivaxax.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_off0000da07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
font_01_sfnt_off0000f21e.bin
c3c39d79565305dd1023ad8744fc13d8eec88e6d4d2a0d236c45eea0918af13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10776 bytes
font_02_sfnt_off00010b30.bin
19dcc04b130e4ad1b65c60fe08ffe3217f5dc2f650bacd2b586a001f47777ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16888 bytes

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