Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59ab03c382c288e…

MALICIOUS

PDF

76.1 KB Created: 2021-07-15 15:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa066abe548085b62fc806e9d2e7389a SHA-1: b029cb6386cf9c1a9c194946ed7cef1aedda5699 SHA-256: e59ab03c382c288e775202c05cd18f7c23bbb19a15331babd6ed4065f7b3ae5c
96 Risk Score

Malware Insights

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

The sample was detected as malicious by both ML classification and ClamAV, specifically as a phishing trojan. The presence of embedded URLs, though marked as benign, suggests an attempt to lure the user or download further content. The PDF structure itself contains anomalies and the overall detection points to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/sq/ugae/~3/J-SxIuB37Ms/square?utm_term=programming+embedded+systems+in+c+and+c%2B%2B+2nd+edition+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f00054fd683a7867ca45de/1626341460322/67017210588.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0067e1fe2fc56fbe5e4ad/1626343038301/the_wife_of_bath_character_in_canterbury_tales.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f01c5f3a4e3014a1c43b96/1626348639547/laptop_battery_life_test_software.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8feb82210ba6bce10cda5/1625882296468/jupoxu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee09a439b8260338661dee/1626212772615/45491266354.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee8cfadf3d323292d4c8bb/1626246394558/pull_up_your_socks_meaning.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8820f2de0a6ebf3486e1/1626179617021/57907796704.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e9284ff107ff2467e95774/1625892943206/animal_lover_quotes_for_instagram.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8ad5eaa19e084bc1f0b2/1626180309679/teturudazevufowudef.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94a850cbdad4d35070a37/1625901702032/ruzewagejijam.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee09eadf274736e0a77ddb/1626212842748/practical_application_of_heat_transfer.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee0dbcdf274736e0a7dfb5/1626213820462/vapoluluko.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_off0000c833.bin
daaad8466f51e22ecf9264a7818664fd3467ddc882d624dd182e1bb6abf9a495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 15288 bytes
font_01_sfnt_off0000ef1d.bin
77c8320450d6d716502424b5688c498830ddd1673c0caf900b4ba24f1cc11ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 11292 bytes
font_02_sfnt_off00010955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 16792 bytes

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