Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bcc6bb7c5db253…

MALICIOUS

PDF

283.0 KB Created: 2021-03-29 12:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a89b53f2389d4de10aa91c85b6c97428 SHA-1: 7b839f3dcca5b72c41db30e3d9e8275fec929bfe SHA-256: c9bcc6bb7c5db25304f734b8d25cd43bebda886d202b46eaf8d759a9e6ffba06
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, masquerading as a search result for academic papers. This URL is likely intended to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://soxebez.ru/award?keyword=henry+james+aspern+papers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474739/normal_604388e3ed3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5fe2c2671cc21.pdfIn PDF document text
    • http://pristav.pro/the_environment_and_you_2nd_edition_ebooknwflj.pdfIn PDF document text
    • http://opt05.ru/gigabyte_ga-970a-d3p_driverssfyr4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/defipedibe/30146575335.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/xalijifufix.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/sql_server_express_2017_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8f4f39-5102-4efb-a36a-77e2e0b3c7c2/fenix_2.0_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/48614512335.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_3fecde6c67ac4575a0f7a71af065a08a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/47434335674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404c05d6-940f-499d-ac4c-16190b21872a/el_manifiesto_del_partido_comunista_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88054494-1d21-4f42-b93f-8f299e67499a/2272613102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a046cbb-07c9-4315-ad88-d1c9ce10efa4/thermos_grill_2_go_fire_and_ice_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d877d5-e550-41f9-9345-a3a6c732c3a7/how_to_setup_airprint_on_canon_mg3520.pdfIn PDF document text
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_6035da34898847559032a6dcec04c29d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41685 4844 bytes
SHA-256: b6f0d0a7443369af2d73b5e16dbed9dfa8f4728e3cd3eff83aa4971d0c3ea416
font_01_sfnt_off000426e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x426E3 11728 bytes
SHA-256: 3b155bcdfa0fa0468201956f2190a6fc877c98ca2f0f80638b4b266ffbdb5907
font_02_sfnt_off00044eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44EAA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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