Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c41fc5edcc813…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 11:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 39573a22feb63ef28ece57d607bcf4d5 SHA-1: 5a1b7a58192dddfdfb680a23c850c14dea8607bf SHA-256: 680c41fc5edcc813b896949d10aefe53ea146022bfcf77409e091ae5ce168cc4
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary purpose appears to be directing users to various websites, with one notable URL being https://kuzutuzo.ru/123?utm_term=line+6+hd500x+used. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://kuzutuzo.ru/123?utm_term=line+6+hd500x+used PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413345/normal_60210a58656a2.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/6e5c357990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd369018ea46.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/49636746624.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/Dhe17jh/72512630245.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/dupibuzovawu.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/18562933614.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/Pjiggif/online_marketing_course_in_nashik.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/what_is_the_chemical_formula_for_corn_oil.pdfIn PDF document text
    • https://jevijoju.weebly.com/uploads/1/3/5/9/135978445/rakesiberilixumepetu.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/rCHhiQw/fastpe-_recharge_dth_bill_payment_money_transfer_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/sYZijid/bricks_demolition_game_free_download_for_pc.pdfIn PDF document text
    • https://lobigemef.weebly.com/uploads/1/3/2/3/132303116/ruwunemuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fc6fe35e7f5b.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/viboxikuz/kolubo.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/bard_guide_everquest.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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 4696 bytes
SHA-256: 14be7fb8cc126202306783b7d0769830aebb8604b52b7a030d64d2b012ec9061
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10532 bytes
SHA-256: 5c292d53aae26f4d4b009ce04497af93313ace6100365e846bfa40cbfbc03153
font_02_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.