Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c9efcda1afce7f…

MALICIOUS

PDF

78.4 KB Created: 2021-05-25 13:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: df4740e6efcdeef77906086b1e50f7c6 SHA-1: 2c952a1e4586cc5da289f50a78ea198a2ccae326 SHA-256: 54c9efcda1afce7f9aba89a7eb737437dd671aac3b6c6bc63e0009a66716f993
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of an embedded URL and a heuristic for a download button suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=book+understanding+analysis+by+stephen+abbott PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374537/normal_602960e807271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_602d3dcc538b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473419/normal_5fdeedb38e586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5fd74fe8b0416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6017c0824fb85.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/towutoginadivu/51641555508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978b6555-20cd-4d22-b20f-9b2d5cf084c5/what_kind_of_grease_for_ariens_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0e7117-9121-40c8-9b3d-113309f2e1ba/lunoduxowixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27972569-585e-40f7-b918-b33537eafb77/telsta_a28d_boom_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5ca77d-1598-4c4d-8402-1ff16c3839cd/rapaxugawozovemuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/vuwakuxivejube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8159fe64-fc0b-4d67-868c-b5296c37fcd8/75065373860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2da820-a535-470a-a186-fbce050f7995/29014656031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75783ac7-80fd-4388-8f0e-b702817e9abc/what_is_the_definition_of_the_word_kinetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6224a674-303d-414f-aa4b-675dcd53d7b0/para_leer_al_pato_donald.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9d969d-73c4-4d43-9672-beb2d9e2027e/how_to_become_an_animation_director.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15c893d-2089-4f5f-9459-44dfb4f7bb51/where_can_i_donate_maternity_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f311fe2-f39b-46d6-b129-22a552a7b350/dometic_awning_motor_black.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_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 5576 bytes
SHA-256: 17d7fa969b1639f2450cbf38b36fa0dc85a22dcb812995164be0e98e62f06115
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 11152 bytes
SHA-256: eed1f75e52714335abcd58370575a8735a9f75f47d7e77aeeecbdaa6792f6c45

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