Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bdb0361648baa2…

MALICIOUS

PDF

74.0 KB Created: 2021-07-18 15:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be91885f1926abeb14221592bd4fcc2b SHA-1: 93c0114c17e65493abbe8f9c1b5ded5bbb8ed182 SHA-256: c2bdb0361648baa2e000ad050f443ca579673c3f24697e66fb0ca345d84060fd
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan', indicating a malicious intent to phish users. The presence of embedded URLs, although flagged as benign, suggests an attempt to redirect users to malicious content. The PDF structure itself contains duplicate object bodies, which can be a technique used to obfuscate malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.1321

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/gPkW7oTCsL0/square?utm_term=the+museum+of+natural+history
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8f2cf4b4775d04a01fd4/1626115884368/nearer_my_god_to_thee_song.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed82ca7ab2906137d73c99/1626178250730/classification_of_all_drugs.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_off0000b5ad.bin
5d0132fdb43b35c3859729677fdb89d60f3c10ea7592cc76f2e21055bdd18a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 16660 bytes
font_01_sfnt_off0000e0ad.bin
3ec99781d70c8512e6f06e4f4ea6af7b5c83ed408f180e516789982b90635a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 10656 bytes
font_02_sfnt_off0000f8ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
font_03_sfnt_off000110fa.bin
9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 2688 bytes

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