Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa1bea42e2320e2…

MALICIOUS

PDF

81.8 KB Created: 2021-04-21 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fb30e4399265ead13d64e3e67051fef2 SHA-1: 43f821c4fd43c5e19b76e3bb0f8a4034d835cbab SHA-256: 1fa1bea42e2320e2f00bcba513ae087d8ab5c1351e779d2d65411e6c1c5e815f
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 domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://vilenefex.ru/strik?utm_term=wacom+intuos+pro+medium+pth+651+%25D0%25BA%25D1%2583%25D0%25BF%25D0%25B8%25D1%2582%25D1%258C PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369773/normal_6038005a63010.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/bemasedes-vilades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_606e927fa5c9a.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/vukodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467322/normal_5fed72751b40f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5ffd808501477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_6033c95b765e5.pdfIn PDF document text
    • http://maloxibosuveviz.iblogger.org/61144652703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_60516088bbf05.pdfIn PDF document text
    • http://linorusani.iblogger.org/pusiduwupamif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_60463459aa48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_605b1ec6c4607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6050905173d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60428a010e90a.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/besififisedutax.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://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_dda3acfa70204d63b57c0f8073c8aa08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d911caf-d2ba-4ab0-be11-191931c6ff0d/tufebewetipupukeke.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_7a1a37a2f2354d2e9e2e126c54950500.pdf?index=trueIn PDF document text
    • http://dikewovob.epizy.com/performance_parts_for_ford_ranger.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_0e18a72ad91f477f973e44fc9b19bd0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8b0225-8112-4232-99c5-926993adcaf5/9875377314.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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5960 bytes
SHA-256: d763cd621678dc07aa058f84c4691bcf6762f594478c3d9fcd2c497284ccac77
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16380 bytes
SHA-256: 922743372b890e2921bbdb631e829f4eb56d49535cff7a0ba299f019b9ae7555
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2