Malicious PDF — malware analysis report

Static analysis result for SHA-256 993a3363bb13478b…

MALICIOUS

PDF

116.7 KB Created: 2021-07-17 07:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e34331544d62aca46266dcd9db12de44 SHA-1: 9f1762c9434ef58c35ba89c35279944809a842ee SHA-256: 993a3363bb13478b1475798dc1440e2819c54e46a94a60f7c8651cbcb3898982
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. The embedded URL points to a resource that, while benign, is likely used as a lure. The PDF structure contains duplicate objects, which can sometimes be used to obfuscate malicious content. No scripts were extracted, but the presence of embedded URLs and the ClamAV signature suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3066

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/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=word+finding+exercises
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9610eb7cc826ddc51899/1626183184275/holt_world_geography_today_chapter_8_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee48e06d75c50a5d448872/1626228960423/increase_resolution_of_file.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed22f36ebf0d48ea8c5531/1626153715763/23515724038.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edb6888b02447bbdddeea1/1626191496616/18799317704.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014eeb.bin
8b3d14e5a1d7160f1eb5e7cc60daf09f9bb0bbec7f2c12e1637b065b58153042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 18788 bytes
font_01_sfnt_off00018077.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18077 16792 bytes
font_02_sfnt_off0001988e.bin
701a2032e02b3f36f71ba7b2f4ad8bb6ac910f19d7348de0947adcdc478a3c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1988E 10440 bytes
font_03_sfnt_off0001b021.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B021 16092 bytes

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