Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59135cee9f3e1c5…

MALICIOUS

PDF

76.2 KB Created: 2021-07-20 10:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c0c94a46b34e0bb9ec3b4c3b0ca5844 SHA-1: 9836ee738039be9bd346193d04b0a038185fb4cc SHA-256: d59135cee9f3e1c5182fdd2fce30099e7b9d01f0530d53cfc7f71de324661294
96 Risk Score

Malware Insights

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

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those flagged as benign, suggests an attempt to lure users to external resources. The PDF structure itself, along with the ML classification, points towards exploitation for client execution, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/AnJPYMJXbyQ/square?utm_term=pdf+to+word+online+with+ocr
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec85a00cf33f708d7ab1bb/1626113440971/give_5_examples_of_decomposition_reaction.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7701668ba31612b4b4cd/1626109697868/92323329647.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0618c6506dc6429e742ba/1626366348419/anne_with_an_e_anne_of_green_gables.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f67d443fb69e7128f7da85/1626766660622/if_clause_type_4.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee8d5da005482cc15aad0a/1626246493718/tadasapaxerepebeneg.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_off0000cc7d.bin
d2509d5ab73e76d19162f88c643cd2afddae5ff19f7995f1cc632639720bae71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 10328 bytes
font_01_sfnt_off0000e3b2.bin
a082a76f586e6882e335d58eeb7205544a9262787aee8b32b9d33f1423a33e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16148 bytes
font_02_sfnt_off00010d37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes

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