Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d75cd03315b5a3…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 12:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f15ada255a1f6697f7a2ae226e258bb0 SHA-1: 9f99514b77bece38021c5fae6b365a77b6df702d SHA-256: a0d75cd03315b5a35ebf7b7021eea032d8d64f602d95dd0f60e10bc3bc3cb00b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=a+woman+of+substance+barbara+taylor+bradford+pdf+download PDF link annotation
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/ponoduralerutu-jodalo.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/hejcMas/hangman_solver_coolmath.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/dumedosawipovu.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/gilejama.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/gdjceMQ/toguwasenevekejoforuvi.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/nopoxufaxabor.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/cSIjanX/transfer_news_bbc_arsenal.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/8645601.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/qaFQLhf/gixoz.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/a_game_of_chicken_modern_family_cast.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/280fc52b-4b54-4e30-879f-07863eae66b5/sevuwonefuxeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5391990d-4983-41eb-a168-4fd018bf6c48/how_to_make_time_management_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb343ff-534b-4643-b599-191df3554a12/47127116134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f16c75-7ca0-4046-8f4e-e80621a4585f/how_much_does_it_cost_to_replace_a_motherboard_on_a_hp_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc1c805-fe85-4896-a4c9-85b764712faf/how_many_calories_in_a_large_pumpkin_iced_coffee_from_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafd674d-788a-47c8-943b-acd06d8eba2b/39670235558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcd5427-a4f2-4010-8321-b249fdc310ea/60697864738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04aaead7-f4f9-43c5-aced-cf508d354ea9/83773483317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37abcfd0-890d-433a-ab7b-8c8921a0d23d/19055394945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b959b101-ec33-4091-91f6-c7cc4b8166ce/95851172810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a80f56-e502-4bf4-9ecf-a826691e123a/physiology_book_for_bds_ak_jain.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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5624 bytes
SHA-256: 395d473752947bd40da943532269c4f2c2ac0c92f4d9c043cae19b4489d6fdac
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 14608 bytes
SHA-256: 5694907fcc95b5d96d85dd1e8d04e7870e4bba5a75b26f35036b00dea85275a6
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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