Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398ef356934ee40…

MALICIOUS

PDF

72.8 KB Created: 2021-07-13 16:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7630b63940963468b57854fa582d8223 SHA-1: 75f83dea5cd5df645d0826e77264cde3b61f2c8c SHA-256: d398ef356934ee401a653a27fd89b0fe4036ce5a44903947d682a021e6f3cbbb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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://pistant.ru/square?utm_term=harry+and+the+bucketful+of+dinosaurs+book+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7f250d838b6c850c68f0/1626111782111/the_lord_of_the_rings_free.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e80bba5c1b84600340a010/1625820090806/4.5_linear_approximation_homework_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed19aef67381323ef3de58/1626151342677/8219945989.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8563626a8d52d112cb5ee/1625839158668/55414648527.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec912e05183b3b579e6ea5/1626116398484/resilience_from_the_heart.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed92b56bb85f4a8d88e93a/1626182325886/just_a_lil_bit_nelly_florida_georgia_line.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed31325eed834fcc33c1a1/1626157362395/hematocrit_test_meaning.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8d020318596fdcc50ccf/1626180866855/how_to_write_address_on_bubble_mailer.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_off0000b9ff.bin
35fa8ee9e0de87d350ecb989d5a0865a15d1c06e92c5cf578f150a9286f2ca11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16452 bytes
font_01_sfnt_off0000e506.bin
3a1e2ebc282b95ba3127cd807315f079dc6184db5300ae1a13f679d2f4dc353d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 11152 bytes
font_02_sfnt_off0000febc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 16792 bytes

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