Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca4322097b92e91…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 18:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a29a26a2026d5135acb30d0a88073430 SHA-1: 03244a198e8507b0f8a5e0ba95ea14a9c99cb9d8 SHA-256: 7ca4322097b92e9171273ca3b760dcd137ac40c76a713d4e9a78ce4a86f7d9be
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to transferring camcorder tapes to DVD, directing users to external URLs. Heuristics indicate this is part of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving JavaScript execution within the PDF to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+transfer+jvc+camcorder+tapes+to+dvd PDF link annotation
    • http://pinerapidsrr.com/dish_discounts_for_existing_customers3d6oh.pdfIn PDF document text
    • http://i-men.ru/internet_explorer_for_ipad_4vw7g9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5fef83e523326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fd0391071aa3.pdfIn PDF document text
    • http://autocredit.moscow/diet_guidelines_post_bariatric_surgeryexvqo.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/boating_test_study_guide05jo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5ffd4a2e2820c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_600a51b4d9150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ff3d1f101e3f.pdfIn PDF document text
    • http://razvivatel.blog/mabinogi_exploration_levelwf3ft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_fff30c40b1fe4a7badf731fb09e935dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/us_visa_photo_guidelines.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_7586093a045446b2a6f9fa994cd367b5.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_f57343103f6049e6a240e05541a1617b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/indefinite_article_exercises_with_answers.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_2eff93be8cdd43b697cb6f90377e06e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/murowamepogexasisomuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/39439220513.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_be186249ac8c4f42ae0f8a045fe3efcb.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_ede5449553ed4da0a05551d4716f8f40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b0e381-e1e0-4b3c-b7ac-3fcf3c41fa01/49536022587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d683dc3-89cb-4cc6-b03f-7c3d021ca210/hp_deskjet_2132_printer_cartridge_price.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_c7f04f3a0a12447892d6a682727101a0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 5456 bytes
SHA-256: eff3fc79c787dbf8cbb37f8262b6e37d5335245a13a04d590c88bda0fa76f640
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10708 bytes
SHA-256: 78e934b4c19e6a6f29a93742d37a2153556bdcce3947125f24f867565aa7dc7c