Malicious PDF — malware analysis report

Static analysis result for SHA-256 5343feb4246e50f9…

MALICIOUS

PDF

88.0 KB Created: 2021-04-20 13:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8c6121cab38db7f4f1a6de7b3523ac3e SHA-1: 462c962682767e765f46c9f69f6709100b3bb98a SHA-256: 5343feb4246e50f9d27730984cdfd2c2696f3c9bd41ee7672d8223550b61dfb7
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to data masking, likely intended to trick users into visiting the malicious URL for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=difference+between+static+and+dynamic+data+masking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470035/normal_6000b2c5f2c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_606356798c665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5ffeb30fd2bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_604dde1e99e6b.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/nusumuwuwoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_6041e1738d3a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5fe3d57e223f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ff12fcb936c3.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/9448335.pdfIn PDF document text
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/0e79509718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6053c90e6ac15.pdfIn PDF document text
    • http://tersq.space/how_to_calculate_rebound_height9fozk.pdfIn PDF document text
    • http://sallely.xyz/68738954406gozx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/thermo_king_reefer_unit_parts.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_3b7d0c8611c24bff9dc0a4fa3ce3f160.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_2a38ffc626b14cf2a644ea427172359c.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_a0708d99d11a45a0ae346447c63aed54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/smartsheet_dashboard_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/kidde-smoke-alarm-recall_user_expert_inquiry.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/axiom_61_driver_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/jafivejuxanexum.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 5708 bytes
SHA-256: a8b403965a4ad47fc8922644abd346e79fcd4c225bdcddc8da6e7930f6978291
font_01_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 11648 bytes
SHA-256: 7f0a09b9a6deb932f2b8a561ced88dff1bb2936c1a5733f1e015a4215185c9ec

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