Malicious PDF — malware analysis report

Static analysis result for SHA-256 937713f3a37407ae…

MALICIOUS

PDF

73.1 KB Created: 2021-07-13 16:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9cb9113abc1838a793624ae5b527c34 SHA-1: 5019072602e2493bf6607f0a04a4164cf3725b30 SHA-256: 937713f3a37407ae878258265c8aecbea9994b7d81f59aedc3d5d3de6120a83f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which is a Google feedproxy URL that redirects to a Squarespace page. While the document body is heavily obfuscated, the presence of these indicators suggests a phishing or malware distribution attempt, likely leveraging social engineering to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7185

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/cEZ-xJcQpFE/square?utm_term=how+to+retrieve+work+not+saved+on+word
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7aa3288cf71862a8a7d1/1626110628097/stye_differential_diagnosis.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76b219d02b035ebdbbc4a/1625778977653/persona_5_trophy_guide_and_roadmap.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e96280f107ff2467ead89f/1625907840379/types_of_eggs_cooked.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_off0000c103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 16792 bytes
font_01_sfnt_off0000d915.bin
b52559d6d6dcd04042f75285a9f1760549c64346eb5ca3cd3e15a3da26b1a7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 15456 bytes
font_02_sfnt_off000100ac.bin
278da396543e512aafe690d7a7e05c721a280405910e94d9736803e9c78f6baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10428 bytes

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