Malicious PDF — malware analysis report

Static analysis result for SHA-256 6679c51f14232701…

MALICIOUS

PDF

74.1 KB Created: 2021-06-03 02:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d24f1c052a48e486d735af92659b3e2d SHA-1: bdb24da89604ba1c613aeb57470a8360b75d73df SHA-256: 6679c51f14232701e9ec8dcd201a23cd33eed06f59fd25b9d3c19e99b4a2c197
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/pbw?utm_term=hirix+hd+dual+lens+dash+cam+fitting+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5ff5995e1bce8.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/878da.pdfIn PDF document text
    • https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/4369961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_605df609d52af.pdfIn PDF document text
    • https://kufowararadubo.weebly.com/uploads/1/3/4/4/134475959/ee39b31383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530846/normal_5fee92d4ef887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fee632dae112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_605d8d6f22636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_604d78c829988.pdfIn PDF document text
    • https://ludubilataso.weebly.com/uploads/1/3/4/7/134719947/4015011.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/89a1525e1f.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://uploads.strikinglycdn.com/files/0e31cb9d-4ffa-4d45-bda4-1d5f5f518c5a/ravid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d6af20-a78f-49a3-81dc-3ae77e970a5d/dadutupuvefemupakaz.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/72095023261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6bcbb9-6397-4051-b040-1faa556877ee/jujegozoxukedogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194bda4e-834a-405b-aa3e-29a0d366d598/rifenelukulidigowabululux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384ed9b3-b129-458a-8159-1c4e1774297e/computational_physics_mark_newman_revised_and_expanded.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/indian_wedding_invitation_cards_samples_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c39bb0-8623-4a49-9d96-5823ea34a944/ejemplo_de_un_sistema_abierto_cerrado_y_aislado.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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 5348 bytes
SHA-256: 9cfd6589e6410bddb7b644d15a1882b5881368e398bce36e3c41b0137419cf30
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10236 bytes
SHA-256: 8fece3e67bc138a2e16c1e337bde96ca32488cfc2b8740d3289d78a6682975d7
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361