Malicious PDF — malware analysis report

Static analysis result for SHA-256 20485193f8d9d0b6…

MALICIOUS

PDF

92.5 KB Created: 2021-03-20 11:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 05fc601d153d6e3fa1137f453da94730 SHA-1: b12744fa5fd442d205efb2949232e84ff1390465 SHA-256: 20485193f8d9d0b6650f53dca0117ac21ebe83fbfdca12211c8a5fc1b1f38438
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many pointing to disposable hosting. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/award?keyword=lightning+arrester+design+pdf PDF link annotation
    • https://raxefikijizusiz.weebly.com/uploads/1/3/4/8/134881470/masusapoxexedalifon.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/5630667.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/domedi-tokitiji-xuganag-fulexonekotaz.pdfIn PDF document text
    • http://igclienteam.com/25811253928cecwf.pdfIn PDF document text
    • http://haustova.com/vodavifapinebidemexawapunyef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_60297a7071feb.pdfIn PDF document text
    • https://zomogazafef.weebly.com/uploads/1/3/5/3/135348967/41a0f82f1a51.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/silajizo.pdfIn PDF document text
    • http://olivamebel.com/free_download_presonus_firepod_driverq2olp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fd2a7430d0e6.pdfIn PDF document text
    • https://gizipuvi.weebly.com/uploads/1/3/4/3/134312628/2196958.pdfIn PDF document text
    • https://xanuvewetarew.weebly.com/uploads/1/3/4/7/134732967/468302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_602247c64883b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcfe61e6902b.pdfIn PDF document text
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/7017620.pdfIn PDF document text
    • http://itgermany.net/43503973748zz7di.pdfIn PDF document text
    • http://getveran.site/schwinn_201_exercise_bike_manuala2ney.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff0a30d6d0dd.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/22d2dea4-134c-4a6d-8f9f-7c01a94a15f8/best_james_patterson_books_in_order.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_1e5c183809eb4d3f91772328f319f9d2.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_0db79e533a0e411988709afb8ae757d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa7effd-fe90-40c5-802d-e4bc583b97b5/49657757743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85483a33-f5b6-48b2-88a5-db47487a1320/flutterbye_flying_fairy_instructions.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_40ed014df77a41bc9a7188326a7e2a33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3661537-1634-4d3f-ae7b-72e0cbf52e48/vugamak.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_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 5212 bytes
SHA-256: aed96c141fca1b93c83ba8574a0e1784c78f95899c6ed2ec594666d061a89a00
font_01_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 11364 bytes
SHA-256: c6b6a1096d4fbce526cc3b09c8c28e5eff3dda2699f15270c8f3fb9f32298e9c