Malicious PDF — malware analysis report

Static analysis result for SHA-256 061cc48e997bb792…

MALICIOUS

PDF

179.2 KB Created: 2021-06-04 15:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04bc3006d667edeeba9f047a1c74d7f8 SHA-1: e6ced10f1f62137f135e552eed40242642acf794 SHA-256: 061cc48e997bb7927740bb40acb790c5fa2bf98829b7cd162c1b72e07c9c7da5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/123?utm_term=biografia+de+alejandro+magno+pdf PDF link annotation
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/mujirigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_604bbf2501ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_60638689b0e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fce06780da21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ffff5a73d710.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412154/normal_60b1e9389f8db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481272/normal_6007d8465eb2a.pdfIn PDF document text
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/worar.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/xiwejanujonib.pdfIn PDF document text
    • https://farevilifowo.weebly.com/uploads/1/3/5/3/135390938/merodi-besebasevo-lazaji.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/e8e37dc8468f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fd2f86c12ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_6005176b27e36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1376d0-ad16-43ba-ad07-4f4d8b86f171/reflection_on_research_paper_example.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/96060997687.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144508134/47090232662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685bed57-8715-4946-9737-d13ed9598ae6/how_to_repair_a_toto_toilet_fill_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d1adfc-02b2-41a4-915b-22d0f86b4655/how_to_program_bmw_homelink_without_remote.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/how_to_use_rainbow_carpet_shampooer_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1eaa4c-164e-46a5-8b05-31858629d7c8/zexudok.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/how_to_use_chefman_air_fryer_rotisserie.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/32055028982.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144468075/college_physics_10th_edition_young_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f3b244-5cd0-4fb9-9254-b6eb451389e7/is_there_a_reusable_filter_for_keurig_2.0_carafe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000256ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256BA 5308 bytes
SHA-256: 28eb4e640d214e03aa78c6b3446642bdb060102f8ed9b3f25dcc6208ee665563
font_01_sfnt_off000268c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268C0 20616 bytes
SHA-256: 94b69b4678a897429d0149a0af52132df9f1282f8daabb6c2210afedb17656b5
font_02_sfnt_off0002a32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A32B 17556 bytes
SHA-256: f50ad90e6f58890b7ef6b94fb7a003775f33ab457e59adfbb0a9d91a6aeb6f3d