Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d6884c6e3bfd34…

MALICIOUS

PDF

81.0 KB Created: 2021-06-07 04:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3ba64e2f2a4fe69bf251784857e5266e SHA-1: ade38a1aa4817b93ecdcaa3bed589ab73ea8621f SHA-256: a4d6884c6e3bfd348a93a785b072ddfbeb26cfb79c2c507d7027cfaf50ef741a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=email+format+sample+for+business PDF link annotation
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/5747464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5fddac7421669.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/vigupezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_603bf956bd089.pdfIn PDF document text
    • https://ralokokotozupar.weebly.com/uploads/1/3/4/3/134340958/valamejaluk.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/sepekakosetunikakos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fdbe8fa82ddb.pdfIn PDF document text
    • https://lefipotadap.weebly.com/uploads/1/3/5/9/135959992/4484565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fc83430138bf.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/75dad322-e2cd-49fc-8f99-94ec333b0667/six_of_crows_series_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba02095-b43c-4b0f-bb28-e01c0f21ee5d/alquimista_paulo_coelho_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3aa2ac-888f-4723-a185-a8a145402bde/65758202743.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144458325/hisense_smart_tv_remote_control_instructions.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/1464554523.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144686034/zidawexubifevigebakod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d276f97c-2e8f-44e0-b3d6-b632716b64b8/xojurusakinumanogifaletox.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144754959/is_the_m19_better_than_the_g17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9532dc-ffda-4446-a921-f73acf46a35b/kavamuxumekurorer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b307162-f0f7-47e7-85e4-5c88305191d7/how_to_connect_vizio_5.1_soundbar_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f8128e-13da-478f-8daa-d97619cfcae8/integral_of_x_1cos2x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2566406f-8fdc-40c6-a82d-f57e33caf30e/furuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c948c51-3e99-4ad4-b2cc-dea735ba0e7c/5913537170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13857166-02a1-4eaa-b323-8d73d4ca2b53/99890125595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f00ba3-4ca4-4e17-ac7d-618d62f73eb6/multiplication_chart_1-3000.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_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 5144 bytes
SHA-256: 3c379d0cdec14700115c9a90149e1f4ac770a3d919cebadc3b8662a7ecf4bcd6
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 11584 bytes
SHA-256: 127bd037837e67565fccbea77256e5491a87b8accc2343ae6e11099206147e71

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