Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d2e08307cedc4f…

MALICIOUS

PDF

72.5 KB Created: 2021-04-27 19:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: add24995782ee67f168c2d2d1eb35f70 SHA-1: 5840ff613b13679de5066e3a0a486096d6be910b SHA-256: b0d2e08307cedc4f50070ee1cb2f81c5f2444a048885c7e8fce8e47afad13650
186 Risk Score

Malware Insights

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

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 0.9998

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://dafemum.ru/strik?utm_term=how+to+do+really+cool+dance+moves PDF link annotation
    • http://suvuxivenorum.mypressonline.com/business_driven_information_systems_4th_edition.pdfIn PDF document text
    • http://kapusta.pro/english_grammar_exercises_for_ieltsn1pvg.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/jumipemunawopif_rudupelutekutof_mimozuk_dixaz.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/b8687851d4a9cdc.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/9856445.pdfIn PDF document text
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/zesikodazodovisej.pdfIn PDF document text
    • https://xakewalite.weebly.com/uploads/1/3/4/8/134882175/66c9fa75f35.pdfIn PDF document text
    • http://pro-komp-master.website/552813932975oee7.pdfIn PDF document text
    • http://coins24h.com/walmart_annual_financial_report_2016p6oly.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/r1gfjg7/escape_the_prison_game_stickman_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/86jgKii/russian_car_driver_zil_130_cheats.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/vukusa/92434993322.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/26_roadmaster_granite_peak_womens_mountain_bike_black.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/castle_floor_plans.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_6693c26d65f54b61bd319058168eaa96.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_9e481cca5a534ee9b9506ee7dfb6c056.pdf?index=trueIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/taotao_scooter_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/vefamejiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/book_seismic_processing.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_b3ba9e5964e24c85808ea9fa1d67e703.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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 5300 bytes
SHA-256: cd41d612287fe31562b4442cd5cc201ea8e69e4ec7404a60ac04152d5fd6eda4
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 10852 bytes
SHA-256: 640419cfaa915565100ab4c5014842095049f9661c6e6e434a25e9ba6e095fc2

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