Malicious PDF — malware analysis report

Static analysis result for SHA-256 91db7d00ca249615…

MALICIOUS

PDF

96.4 KB Created: 2021-07-13 11:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17eafd9ee48a28b96158d36e7475abfb SHA-1: 79f61ba286cc0ad54d18f43f53da6b0c62d83d4a SHA-256: 91db7d00ca24961550c106b1f5a95fd3968780381744620c0eaa5031d4449930
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to external resources. The PDF structure and embedded artifacts are consistent with phishing or malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/v-xubMviL4Y/square?utm_term=i+just+want+a+job+that+pays+well
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed12b667dd777ebfbd4ea6/1626149558808/law_of_obligations_and_contracts_example_cases.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed36d2840a1961e7b45074/1626158802216/the_half_life_period_of_any_first_order_reaction_is.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e95cbec91b61347ea5513c/1625906367094/ganga_quiz_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ed15f492d21a0f687ec1/1625877781346/rumepotezufabivexazinanok.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d3adba333063f17818d6/1625805742307/dry_sherry_replacement.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecab99651b7076defea579/1626123161837/structures_as_function_arguments.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e65812fb7d0b2790536c/1625876056094/lake_near_squaw_valley.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e78f964454ab0ddd818c7b/1625788310339/kirigilugezi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec93c6e7718717d76361b2/1626117063567/49105911138.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_off000117c1.bin
dfaa15a04646f2ca84a05e849fb2e5f36c0be957ecaf8b668508232a0a08cdb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 17252 bytes
font_01_sfnt_off0001450a.bin
032a1381b5b88211c13cafb658a08310384e9d5d0b0c4bcd6974b92723628b79
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 10676 bytes
font_02_sfnt_off00015d5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5D 16792 bytes