Malicious PDF — malware analysis report

Static analysis result for SHA-256 20baeff60b2bf786…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 19:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a9200551da21dc9596a8910525023678 SHA-1: 40a2c666694e80e86c65137da63d6dd39f938e3e SHA-256: 20baeff60b2bf7866b8e21c1b5bfd5bf6b331097606fe82f5547bfd6d974b38f
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 phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://golowaki.ru/strik?utm_term=sketchup+warehouse+without+sign+in PDF link annotation
    • https://cdn.sqhk.co/jiloduvunilu/jghcihC/mofatotosivededefanatam.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/5710854.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/personal_assets_and_liabilities_statement.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/tojod.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/ibjjqPM/jibjab_happy_birthday_fart_song.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jhZhhhh/contour_next_ez_meter_kit.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/kolaxupaxebapu-wugogefejujajab-jobisekim-pebitirotobew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/airliner_classics_magazine.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_c18bbea8ddf648e8a6acec8d91d78b3e.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_9fa5ed4f73f946109daa53c20aba7c81.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/tibixonoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c520bf-97e7-45fb-a741-afac52aa7012/dirt_bike_parts_amazon.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_74de6a71096b4004974a62b2a547e4de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ac3bec-11ea-471f-9604-8733e60237f2/89525565822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3195632-81f2-40b7-91c9-80e715fed10b/metotelejagexilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487fd442-9486-4289-949c-b69c505b5221/zopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23fa0bb-240e-4fed-b6bf-5acfbc89d42f/zusomotufugafadekifapogo.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_49e8a1553567436896d143f7d21daea2.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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 5420 bytes
SHA-256: cd9408bea6160f4ec5e565d8fb88c83de4a1a8f4958255d82944502822ab974a
font_01_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 10468 bytes
SHA-256: 3c3997fa8923402a8f9afda027ba0e15baf14b601752685a00e06cd4b77e2389

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