Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f3203a16092e68…

MALICIOUS

PDF

122.2 KB Created: 2021-04-04 11:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2ac3dde4fa7b5d36666c2774dca9b328 SHA-1: 7e7a826e1ba0de0b6ffd7289934391b9f9f03020 SHA-256: 18f3203a16092e683ea61f61a092eac8fe2e467fe4d922a27da07b74b4c3c9d2
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=the+argonauts+maggie+nelson+quotes PDF link annotation
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/vigiga.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/50945855020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_6025b24a8f06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fe78f59a0b3e.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/5067614.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/17624491579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fd6a7165de76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fc8e17512f89.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/90947217451.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/54b34c7fbbed.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/67408804653.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/kimaboxagexan-xixidujejet-luxil-purakoja.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/water_billing_system_project_in_php.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_6064e536d2b31.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/1716b.pdfIn PDF document text
    • https://matupazuru.weebly.com/uploads/1/3/2/6/132681479/20445.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/union_budget_2020_download_in_telugu.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/loxaradawisum.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/mercruiser_5.7_service_kit.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/8740155.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
    • http://gumomexad.onlinewebshop.net/raduregezugarexopow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580c8c86-2e04-4dc9-83b0-6bdd3517eda6/what_document_created_the_three_branches_of_government.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/sadunis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e669bbb3-e16c-46ee-b688-7377a2ff2c21/49568866373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48dbb172-566a-4989-8c17-20e3178baad7/74652329462.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000193c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193C7 5056 bytes
SHA-256: dd51baeecbce68537116216df94c4361afb43c9a0318fe25d8535ece3e351d91
font_01_sfnt_off0001a4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4C7 11272 bytes
SHA-256: 68f6845de91485ee8123de7a481407bc703c7b3cbba61b5f56fff4ea0e103089
font_02_sfnt_off0001caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAEA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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