Malicious PDF — malware analysis report

Static analysis result for SHA-256 537043ac30d8e29c…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 04:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbae781cf46de5b34af26c334b2e85f0 SHA-1: 707b252cdcedf59bad8271459eda7faa831fb6f6 SHA-256: 537043ac30d8e29c66fe080de871fdd48e5d710bb8c4e23de805b5722f85a2bf
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 URL that, while currently marked as benign, points to a resource related to downloading software, suggesting a potential lure. The PDF structure and embedded artifacts do not provide further specific indicators of a particular malware family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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/uzX87CUNjRg/square?utm_term=truecaller+premium+apk+free+download+for+android
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e78be14aaab0286a861a27/1625787362114/87066482632.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed7be26bb85f4a8d87870c/1626176482974/sidetrack_happy_hour.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7a98b38ed220952aabfab/1625794955640/79131801446.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec841d0cf33f708d7a808e/1626113053417/how_to_combines_to_make_one.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e789f4afd06e4982e5947f/1625786868514/lipulaxekubasu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee2a90115d504d3a84e82d/1626221200305/64084992183.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_off0000e321.bin
1371d59522a84ba886da62576f810468ca02b007872f3210671953ec7f4f41a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 17508 bytes
font_01_sfnt_off00011166.bin
5722e02dec85d3b27c569285d386d93b24cbe4c9cb5b33a6fc292122afdab374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10756 bytes
font_02_sfnt_off00012a21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes

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