Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf33e7c348702a53…

MALICIOUS

PDF

76.4 KB Created: 2021-07-20 09:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3018cad494012f45e004951b99a8690a SHA-1: 64b097511a8d2880d07e8ba156767754fa18acf9 SHA-256: cf33e7c348702a532a8742f68e4dda8625a0ae87783c441c7d26851f8bec781e
116 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and potential exploitation. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest it may exploit PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/sq/ugae/~3/5Aj-mlxkUx8/square?utm_term=india+post+tracking+number
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efeb375d627c4551e182ae/1626336055457/77627912086.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f63b7faca51526688d240a/1626749823846/tle_module_grade_9_household_services.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f256d46c177f33d79878aa/1626494676452/24435783188.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_off0000ca10.bin
b6c9a295c4343302b79404f1cdc575aeaf51c9a1074d186d6c689c7fce5e7eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16452 bytes
font_01_sfnt_off0000f4bc.bin
635eb50b3f9dfb6fa8b4d2eb844f957fcd4abe5f4997dd811758c18c2f30ac88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 11092 bytes
font_02_sfnt_off00010e36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes

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