Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2439a9e94cb37de…

MALICIOUS

PDF

123.6 KB Created: 2021-05-08 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c7a94a5b5faf9e3733833bf257b68929 SHA-1: 92760fc6710bd0db7ac8ee3a8e5c4fcd6bc4f100 SHA-256: b2439a9e94cb37dea652284eec5892788f15d9f8b764f21ed95c133ed72027d9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=song+of+solomon+2+kjv+commentary PDF link annotation
    • http://kononameve.mywebcommunity.org/catalogo_bujias_ngk_motos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcfa24bd40f1.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/59964724273.pdfIn PDF document text
    • http://static-start.top/jetojuvovovutorudezefet8wbu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6016d4ec2d30b.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/dumenuvex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_60353c7134c8c.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/11376625457.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/boron_properties.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/giriwasinu-wufadenuzikig.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/7149724.pdfIn PDF document text
    • http://icub.tech/gezugusg3l0y.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/3121cc65faa7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5ff2a1eeb9eb9.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/61570864814.pdfIn PDF document text
    • https://fumuteserem.weebly.com/uploads/1/3/5/3/135333711/kabujoxa.pdfIn PDF document text
    • http://servempieza.site/sherlock_holmes_case_book_gamepb6jf.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/how_to_clean_and_repack_trailer_wheel_bearings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_cbfa831f1878496a8adeedb6b85dc805.pdf?index=trueIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_36f6eb4a85c742808ee5662778ef2385.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/current_affairs_2020_in_english_with_answers.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_e95e1b45497b4364b4f3ea7db7b20e25.pdf?index=trueIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_58bfabeb363748b6a1c850b13ef956ea.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_271957d4bcba45fbabd79d4c27a2ebe8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001861e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861E 5480 bytes
SHA-256: 590a02e3b59468ee2e2ed7ebf2c8bef69a21e06a1025bd6defca2e1368339615
font_01_sfnt_off000198ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BA 20132 bytes
SHA-256: 54410bb7edc8bd1a75a93d87f473427a383ea558716480bfc00d910c22b5167b
font_02_sfnt_off0001d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D24B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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