Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bafb7aa901d001…

MALICIOUS

PDF

77.9 KB Created: 2021-07-15 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65521ec67897f6d260af9315becb7754 SHA-1: ba5fa070ad336186ccbd69ba371504138346bb08 SHA-256: 99bafb7aa901d001d88109bcd84a025333fb4019d5321b7dab0db0eb9d91d804
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to trick the user into visiting a malicious web resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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://huntic.ru/square?utm_term=top+50+gk+question+with+answer+2020
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60efcb597fedc2490c085639/1626327897447/82940873903.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc8d824c32e4364b1bb99/1626196184193/causes_of_environmental_pollution.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecf923fc46f1629affb626/1626143012206/i_know_that_you_love_me.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ef6cfc46b1505825e040/1625878380598/on_the_jellicoe_road_download.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e31cc14ff043cd5977f3/1625875228416/300_square_meters_in_square_feet.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_off0000cd46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
font_01_sfnt_off0000e55d.bin
7fd68e5f4276dfdcf4bdfa4b7cbc3dc5bb5a78b544d3cc786458e37b9e24d9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 11248 bytes
font_02_sfnt_off0000ff8f.bin
850eb7de7c8d4a48d605d32213080b89df769a3055920b7e87c94c29ab3f2a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 17000 bytes

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