Malicious PDF — malware analysis report

Static analysis result for SHA-256 694e9deb90cb9623…

MALICIOUS

PDF

87.1 KB Created: 2021-03-11 01:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cfa6fa1ea83a4dc85ed5b6dd814b822d SHA-1: e4829549b4f055b7f239096fba2633355d1705aa SHA-256: 694e9deb90cb96234eabdba245cc099f44c62daebcb8bf782d1606ce67fd626a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=the+samurai+code+of+bushido PDF link annotation
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/9995782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_601d399e04592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fe14758b4731.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/jinuxifexaruli.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/df42bacd7b6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_601e92607d8a9.pdfIn PDF document text
    • https://dawawasokiju.weebly.com/uploads/1/3/1/4/131408838/2e09b36c0820ce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fe2b44255a50.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/9a238f32ec.pdfIn PDF document text
    • https://guxanavos.weebly.com/uploads/1/3/4/2/134235011/tiwutulu.pdfIn PDF document text
    • https://biwaxosele.weebly.com/uploads/1/3/1/4/131437294/6984184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_602c470187053.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://s3.amazonaws.com/nisiwanolom/free_blogspot_template_for_books.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/42934445576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7007e75-de36-465c-a184-0ed6e8c69dbb/the_elder_scrolls_v_skyrim_special_edition_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df76bca-320e-4780-b583-45ebe12de7d5/retepepevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acbd9b9-78d0-4e60-8abd-08593f6db3de/fekopokidutolobaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1adeb5-0d01-413c-bb63-4cf8729223c2/how_much_is_bobbi_kristina_brown_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/msi_afterburner_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/bonnier_kundeservice_iform.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/consew_226_parts_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c910695f-abc9-46c7-aa34-b440a6b79be5/what_happened_with_fox_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7afac4b-9020-495b-bb14-e8e433b22aaf/guerra_carlista_valle_inclan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c261a4-d4ff-49be-bb6a-2acbb8840ca5/3798373078.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_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 5016 bytes
SHA-256: e4b5f03895b529f0b96a6e0869e102ef59ce0991243a0a61694ac479eb2efccd
font_01_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 10708 bytes
SHA-256: 018769bb6df0741544162170af60061a83ac3c1f9751a5dca4ec9eff8b303501
font_02_sfnt_off000140d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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