Malicious PDF — malware analysis report

Static analysis result for SHA-256 5620a408bfce379f…

MALICIOUS

PDF

73.4 KB Created: 2021-01-01 20:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45f8e5852e5eda4f74d456d3e7e43be1 SHA-1: b8b971a73ec4723fcc38205f5f2c502d7f26990b SHA-256: 5620a408bfce379fe74e2a4349d1ec5a61e980b2302716445689e55947201d86
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=tops+under+jumpsuits PDF link annotation
    • https://cdn.sqhk.co/xotabuti/iehdJjh/50284696310.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/sipemefojin.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/ibjjthf/brawl_stars_wallpaper_iphone_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f93aaeec82c1.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/QlUhcrB/globe_at_home_application.pdfIn PDF document text
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/c9baa5868098.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/RUQFzQa/48421938480.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WNBp1pJ/88196544256.pdfIn PDF document text
    • https://sevepamazajekul.weebly.com/uploads/1/3/4/7/134745822/soparutuj-jevadize-ridina-lugexoraxon.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/14a278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fee4308bdb56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81766fc9-9573-4be6-9e1b-9c4614d279b1/cold_steel_recon_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/nifixewetakisof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 4888 bytes
SHA-256: de1ba73d7921f7862696259d6cb544d5feabbf4e006c856aad1d98d3e52d17ee
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 10664 bytes
SHA-256: febb021b6f64817b33319dab22559a988e046da2d9c1ee89bb82cd5d53109f39