Malicious PDF — malware analysis report

Static analysis result for SHA-256 358a5e4a6211ace7…

MALICIOUS

PDF

81.2 KB Created: 2021-01-29 17:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0396e82f2bb486d9c4047043161d4983 SHA-1: e308f83d3d74f826722604ba4926871496f7c5c8 SHA-256: 358a5e4a6211ace73db71ad76c9564c527113824b597c0decaae705fa1f953cf
126 Risk Score

Malware Insights

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

The file was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://traffset.ru/wb?keyword=swot%20analysis%20example%20nursing%20shortage', are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/wb?keyword=swot%20analysis%20example%20nursing%20shortage PDF link annotation
    • http://bofinaposo.iblogger.org/17171061417.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/jdhaVic/color_cube_puzzle_solution.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/cFLpJhe/diwumejovurofivafuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fe26a432c247.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/1VLhgLj/deals_dollar_store_phone_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/d2o3jep/zulimuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/ggl5wgd/zoho_social_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fd0983fbec31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd5fa98ba04c.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/icidgjd/nigovurututuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/hjdYijq/79127586140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golujaxi.epizy.com/android_studio_google_assistant_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/40383098947.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/dead_poets_society_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/averroes_ibn_rushd.pdfIn PDF document text
    • http://jupanifoz.epizy.com/48293647363.pdfIn PDF document text
    • http://nadalapaxizo.epizy.com/wild_animals_worksheet_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/31142508177.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/rogers_cable_tv_guide_barrie.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_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 5596 bytes
SHA-256: fdde0c98cce5cbc2b062946e24e02b37af4a2e3245c5c5a7cc37ec4d5ca71abc
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 10272 bytes
SHA-256: 31da748072945e583fb7491f6b9db05416ded24622d456ce6051ba0db3fd7b8e

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