Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4db89e9466bfc9…

MALICIOUS

PDF

74.2 KB Created: 2021-07-14 01:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d0da18d85ccff64ea69583231e507f5 SHA-1: 4260f7f1e14dea3a622811bdf1a642a1ff06b3c7 SHA-256: 8b4db89e9466bfc961dc6d3f529e4934a9af43436a2f819bb1d0e538ee612e02
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI and a visual download button suggests a lure to trick the user into downloading a secondary payload. While no scripts were extracted, the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7078

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=how+do+i+open+a+pdf+file+from+my+email
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee08a78e3fff2bd3bc44d6/1626212519793/wordscapes_cliff_7.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee06c8afeffb59e67639a3/1626212040428/both_ankles_swollen.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed8e40f8b4e244e40039a6/1626181184599/river_of_fire_warriors.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca89d0f7d8d50062f4e06/1626122397565/sumidutesadidexi.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_off0000c271.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 16792 bytes
font_01_sfnt_off0000da83.bin
07ba90a6102469e5a568a6e14f93619c086e447d3ccfdf1c6ba2bc80a5445710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 15744 bytes
font_02_sfnt_off0001031b.bin
381f6fcf7b615943ce2e290aa8115c54e6d8ad9862902f7a37b5edaf76a1161e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10584 bytes

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