Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cafbbd202f05283…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 22:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4db13cc491eebbd526dbd90331e7454e SHA-1: 8b2d4da6dde0d86a16f27e01190ed16614746db8 SHA-256: 9cafbbd202f05283e514544656ba11fe6f75b9f943e18f2ba5326c6704a7ce20
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=construction+safety+management+plan+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369179/normal_604898fad4328.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/tagunovi-fesowo-balek.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/tirot.pdfIn PDF document text
    • https://nedosadowizo.weebly.com/uploads/1/3/5/3/135347652/karegejoganok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff024ba23c9d.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/is_the_movie_after_we_collided_on_netflix.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/how_long_to_cancel_a_car_lease_after_signing.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/faporetaxodir_pezajil_vewovu_tivuduwopowa.pdfIn PDF document text
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/149276.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/jodegotokajibeg.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/90458139872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fc745a6bd746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fc5a245cfade.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/46457886207.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/5186911.pdfIn PDF document text
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/9e972bd9008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6011d067f3a3b.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/mubeleruniriwi.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/sogaxabiwunamu_sosixiz_saludasavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_d20e5bbd9dd74638bbea7f36f57ef31e.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_79f8f93f40324f7f9a73448b70365226.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 5340 bytes
SHA-256: c0fbd19b8adcce578785215842f92b10556e87c02e133f9010d23de8619b185f
font_01_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 10756 bytes
SHA-256: e0a7c0a66b9e7815ad3847f1900ec0383c66775f8ebc8d2e376ab36b6b0e03d6