Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a67e637e78fca…

MALICIOUS

PDF

70.5 KB Created: 2021-01-26 06:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 120b0d14b247bd032c22f022aa050a99 SHA-1: 751845794bfb343b357dbc013fc8dc032e9281a8 SHA-256: 041a67e637e78fca343e1ba1ca008921c08de53d69f7b3f18d9979e55d5104b8
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 pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://leonvi.ru/123?utm_term=how+to+update+echo+dot+wifi+settings PDF link annotation
    • https://cdn.sqhk.co/mitugejaxel/bxgejbA/bogad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd9b69cca90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_60035dc599047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fe3db11cba8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5fdd45d64fe33.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gdididJ/rusted_warfare_mods_and_maps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fea3786d1efd.pdfIn PDF document text
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/potonep.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/dijjijb/swot_analysis_of_samsung_company_ppt.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/954178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fdd749297a31.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/perolejabobo.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/ii79lih/shot_put_game_ball_weight.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5ffc4945e356f.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/5504457.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/bicyjbW/47760031590.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/63Gnhgd/70552760549.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/MZiiDgi/48643224917.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ihCibKL/56576530447.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/cf7e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenixad.epizy.com/lopirapilozopumelijaxu.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_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 5340 bytes
SHA-256: 69cda40ef2b9a6d4a543e2a489d1dfb1d970a17adeedfeb63d90f4a33aad24ed
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10592 bytes
SHA-256: a3b69aaaa8e5d5122108b3f66b406f1aa0cc5f83124c692b7679af8e4915f9be