Malicious PDF — malware analysis report

Static analysis result for SHA-256 c939525093600940…

MALICIOUS

PDF

109.6 KB Created: 2021-06-05 14:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f20ada73b7138693531e17ae7422eb0b SHA-1: a9aabde17d0979d71bddf5a6abfb30cce3ccd8d2 SHA-256: c939525093600940974ba19709b55051d1452f793128a94b8029a27dda8743d7
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 0.9996

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://queure.ru/pbw?utm_term=doraemon+nobita+and+the+birth+of+japan+2016+in+english+sub PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403952/normal_6055a3342d8a4.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/13fafa69b9b.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/basowutajejigijuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fd8e6e5373c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_601811a034751.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/xomutamixutimo_saxedeje.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/2762773.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/1558488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff27455f3e72.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/lijifevaxil_tamapizufixored_dirujumoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390330/normal_60009e4d871ad.pdfIn PDF document text
    • https://vinozesuwoda.weebly.com/uploads/1/3/4/6/134685541/c4b64e66071da.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/a0a26648-899c-4018-aa5a-f3795f191f26/36522204524.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144512256/59377084894.pdfIn PDF document text
    • http://farejutotej.pbworks.com/f/72493981246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4589d312-4a06-4a61-9085-bc7fe70c4ed5/will_ps5_have_gta_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811e60f0-7b89-4405-ac19-59856f7d1887/kibizakedefibofixejekaro.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/how_to_add_cheats_to_epsxe_2.0.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476af654-cce3-418a-8557-14efdef4896b/lenovo_g50-80_i3_specs.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/nolesumejujaravi.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144506580/la_era_de_hielo_3_doblaje_espaol.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_off00016eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEF 6152 bytes
SHA-256: 89f1e66c996cc78d261267b6640b424c7e9388d8c7ced853c271927bc1a05726
font_01_sfnt_off000183bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BC 10688 bytes
SHA-256: 76e8a12a56b0c3bd970f1bf6466e2b33bc9e1dd0c7e07be6c2ef5206c0b27dca