Malicious PDF — malware analysis report

Static analysis result for SHA-256 c253d4acd49792e0…

MALICIOUS

PDF

80.4 KB Created: 2021-03-12 01:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f840e72947708328c4639464b2a38d2d SHA-1: 52e12b00cd13898797a5042a8f1d79c3a430b776 SHA-256: c253d4acd49792e05b1432d16f868e43316e96d106339403b67397e422fa15ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 explicitly extracted, the presence of external URLs suggests the document is designed to redirect users to a malicious site, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=statistical+learning+with+r+pdf
    • http://dkshlyap.ru/15747794885wcu38.pdf
    • http://specialsale.info/algebra_1_worksheets_onlineonvbb.pdf
    • http://astrohelp.space/bluebells_of_scotland_trombonenxt7h.pdf
    • http://filanion.online/2302411514uh2j9.pdf
    • http://yatvoyya.fun/999756187860j1e3.pdf
    • https://cdn.sqhk.co/vedanoderifu/gjlOhho/senet_rules.pdf
    • https://cdn.sqhk.co/kekelivig/EjvGCjh/18444602581.pdf
    • https://cdn.sqhk.co/todiwapubu/Wjhiahj/std_10_maths_textbook_gujarati_medium.pdf
    • https://cdn.sqhk.co/saturarad/gbYdLcJ/xaratejuterozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/691be2ad-9168-4f73-85db-3a0248df8c85/artigo_261_do_regulamento_do_imposto_de_renda__rir_99.pdf
    • https://uploads.strikinglycdn.com/files/a9de16d5-cdd4-4caf-94d9-f9c133991eaa/73031708861.pdf
    • https://uploads.strikinglycdn.com/files/f3193ca5-0b02-4606-a034-7acfb7cce714/luxaduxogulimiwotezux.pdf
    • https://uploads.strikinglycdn.com/files/351f7a9a-996e-4694-a4eb-cb9db4c70152/86246401258.pdf
    • https://uploads.strikinglycdn.com/files/cfdb351c-5a44-41f6-9822-58909ad95447/safurerele.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/95681075970.pdf
    • https://uploads.strikinglycdn.com/files/2d04bb9e-22fc-4d78-b736-6ab999441e8d/wheel_of_time_graphic_novel_review.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_write_the_degree_symbol_in_latex.pdf
    • https://uploads.strikinglycdn.com/files/1fd725e7-fa49-407e-8e5e-e79f90ff2554/tabla_de_equivalencias_de_unidades_de_medida_del_sistema_ingles.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc6.bin
bd604edf4a39f24b75d960f2510538556b0fae702f34331d7dd93f7624c7c5fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 5612 bytes
font_01_sfnt_off000110e8.bin
7df492dd7c347f111ad7c5323b514ec57f88995f0b0823e4739f058ae5c2b78c
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10504 bytes