Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dafb3c1929eeb9…

MALICIOUS

PDF

69.5 KB Created: 2020-11-26 13:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7979ddbb403549fb9113593e5874bf7 SHA-1: eb1774daa85a94c5562589b2f00318e101f0309d SHA-256: 78dafb3c1929eeb965152ab2221d12c3ec90d9a4c511379785e58d614deab08e
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 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.
  • 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://gettraff.ru/strik?utm_term=remote+control+army+tank+video
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fb5dda163c60.pdf
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/xovetituvosomi.pdf
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/ba0c79e969.pdf
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/xagudag-kigexewegan-goban-lirekofaf.pdf
    • https://sowufaxekip.weebly.com/uploads/1/3/2/7/132710719/0165b00ea.pdf
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f873b12b58b6.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5f9e9e50a33cc.pdf
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/26a36201e58cb03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetare/labofadokilex.pdf
    • https://s3.amazonaws.com/zuguvoxoki/68497445106.pdf
    • https://uploads.strikinglycdn.com/files/48d0e913-5c40-4ccd-b739-0b92e2228e1f/9589833942.pdf
    • https://s3.amazonaws.com/xifabilejilab/769169930.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3db.bin
70fe8b29f946a98ce54d010213a676df0456ab97284d29c3834d8b0f367248ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 5140 bytes
font_01_sfnt_off0000e552.bin
690f2e063df5c0df932494d36a2485f189f99a9ce98969e31c9279ff279497b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 10652 bytes

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