Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc5c81ab5604148…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cd11dd12eab202f28746280c4bd3455 SHA-1: 690d4df7401f994ff08eacb20c19199cd3f86ed5 SHA-256: cfc5c81ab56041482d57764d58d9a3ef78f859def67ff88d4d68861e059ba6c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct the user to external resources. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may contain obfuscated JavaScript or exploit code designed to execute malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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/gPkW7oTCsL0/square?utm_term=work+barge+with+spuds
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7dcec57d2352c927c7ae1/1625808109033/dispute_the_validity_of_a_debt.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8945aa539923b58a9d39/1626245445691/mufedozot.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec80bed0153e73bf8b7ce0/1626112190977/2002_acura_tl_type_s_owners_manual.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e874d047593a5cf72ed001/1625846992439/ob_gyn_residency_personal_statement.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8d96f95b5524f95519ee/1626181014660/923_country_code_phone_number.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e809636e46386ca3c277b1/1625819492151/ximegafawurixiwamut.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee4df3114e6b7b7de80faf/1626230260007/tedixipibovapumowiz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee53e72a4cda17625f8081/1626231783136/king_county_sheriffs_office.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7aab7e2b6271615a8633/1626110635471/jedipozabofapubo.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed8d96af556171212792cd/1626181014531/jolavegamofakov.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7d71869e16759cf758d75/1625806616195/97403320216.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_off0000ee7f.bin
c1d2c833e3a06b8aea75f86b9a7d1d809626ae2194cde76d09c7c7f10516cf34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16788 bytes
font_01_sfnt_off00011a79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
font_02_sfnt_off00013290.bin
fc48b07d1cdec9163ff3c08a1ca875333fe0173a3802aa512d04792e13c65e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 10932 bytes

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