Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a759dcba67fc5…

MALICIOUS

PDF

138.7 KB Created: 2021-07-17 13:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98d87565468bf6560ed7c11d87011e38 SHA-1: 1103b08cfd682c7724ed1e7324640c9c8b2edd1e SHA-256: fd8a759dcba67fc52ab9ebf8c0ee977df653748b04e2d82fbacb643d5be5dbf6
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Heuristics indicate a callback phishing lure, prompting the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to engage the user in a fraudulent conversation, likely leading to credential theft or financial loss.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3732

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/v-xubMviL4Y/square?utm_term=between+the+world+and+me+book+club+questions
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f08bb5e3f0fd10d4e2ef4a/1626377142031/prevention_and_treatment_of_malnutrition.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0578bb4c8e87452cdfca0/1626363787728/vekedaligale.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f219a50daf9c1dca12bffc/1626479013725/81754392483.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_off0001b586.bin
407391a12f0414ca0fd161c25eee91d59633b25d47cdeef617f6a6c8da08655e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B586 11252 bytes
font_01_sfnt_off0001cf92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF92 16792 bytes
font_02_sfnt_off0001e7a4.bin
71d002b4ecfc434d890609b33b5e7030cdde920ff96d0ecb2ad7815b948bd1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7A4 21680 bytes

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