Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe39ff3ddb73d5c…

MALICIOUS

PDF

90.5 KB Created: 2021-04-28 08:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4a38a2f5829f37901b57af6b88e03a00 SHA-1: 00d6be41f2838fbde0b6c2642c97cd52ad12f1db SHA-256: ffe39ff3ddb73d5c7a1fdfdb2306ccaa0089fa797d80c42addfa29ee489103e1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=going+postal+hours PDF link annotation
    • http://mokaxizekebade.scienceontheweb.net/6th_pay_commission_karnataka_kannada.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/materiales_en_odontopediatria.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/tugowigijawimabogigawar.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/12982967486.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/bike_frame_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_3e75a9dfb51d47afa091b1706c3dc74a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a870bcc-0ee1-4086-8fd1-24d66b46736c/mojidutewusosukus.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/merge_excel_files_to_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa39c923-9749-42e1-a74e-c1699c05e178/vutidekexuwibapinujax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474a70ed-6e28-40d5-8642-c309c4af9188/63863953448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec261a9a-2b5f-432b-baa8-2d4de60518b4/timothy_zahn_thrawn_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2c1560-d88c-4c6c-aedc-5b45a13583a1/2002_honda_trx_350_tire_size.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/58494310984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67238a1f-b769-4f20-a8e2-aa18c29eaa36/what_are_the_4_key_components_of_natural_selection.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_6a26a7f3cbd14a65ac1a2f00c3c720f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e039953-f8ab-463f-8193-3e2ecfda4050/barbri_criminal_law_outline.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_88d3f2e8b19f4e61a0c3c03cd6c3c0b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e415b4be-f38d-4312-a5e0-86cac57d37e0/tazaniselewafibapiwonoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fe1b1c-149a-41c3-b33a-61f6e1e6b409/distance_formula_word_problems_worksheet.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_2c12c9a646b547a0bb120ffc002adf0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8759fe0-2d30-4769-bbed-777ace23997e/what_are_the_different_ceiling_textures.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/21503108006.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_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 5112 bytes
SHA-256: 1510dde9059eacbc6af83e4b84e1a440f5157d117c4d4fa98e39c6eb5d26453d
font_01_sfnt_off00013478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 11828 bytes
SHA-256: 06679c4dc543674ef832c55204930d9c445b34d945d4ab44b359ac92870d91da