Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7184326fe0843a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 20:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 031c92a746a7c919a8ce0b188fb19bc9 SHA-1: 421b84f81324b961426c1bee072414f29c50978b SHA-256: 6b7184326fe0843aab033079b05e9eb24a07673c43701971ef2e773e1ac08f6f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a suspicious domain 'gimoguvi.ru' disguised as a 'dcu guide to referencing'. The PDF's structure and the presence of many links suggest it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the overall pattern strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/wix?keyword=dcu+guide+to+referencing PDF link annotation
    • http://fitit.space/guvuwezoxilifalaselzpbd.pdfIn PDF document text
    • http://nosesakegipol.iblogger.org/comparative_research_design_quantitative.pdfIn PDF document text
    • http://itfamily.info/is_mis_a_useless_degreego17w.pdfIn PDF document text
    • http://rowejabajusape.22web.org/why_isnt_my_canon_printer_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_600ca02d0e99b.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/strategies_to_develop_critical_thinking_and_problem_solving_skills.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/project_management_flight_plan_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_600528c4df2fb.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/similarities_between_romeo_and_juliet_book_and_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_602448f254d72.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/kindle_fire_hd7_4th_generation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisunomimat.epizy.com/47580742153.pdfIn PDF document text
    • http://betoratawetaduk.rf.gd/capacitors_types.pdfIn PDF document text
    • http://nifukugobu.rf.gd/nintendo_wii_internet_error_code_51332.pdfIn PDF document text
    • http://zapixunujunepij.epizy.com/how_to_connect_crosley_to_bluetooth.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/46370418044.pdfIn PDF document text
    • http://lesexuxu.rf.gd/dasutobigexopubogeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22ef98c-8361-4495-aca2-1e97224e46ea/reading_comprehension_bookmarks_for_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a0b152-e3af-4c38-9456-e66052d677f4/shadowrun_wiki_elves.pdfIn PDF document text
    • http://lizomepikoxi.epizy.com/tidegiwatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cae6fb-8dfe-4c57-b766-87dfad22c5c8/31043227871.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/laporan_pendahuluan_anemia_terbaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751205c3-cb90-4b23-a424-9620fa7c9544/bimowekiletuzufawopebero.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 4768 bytes
SHA-256: 1dcc7143095972be7e10a329c6def4d669c922d2569b9316150ff2f9f72af29c
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 11460 bytes
SHA-256: 18e0692217ac391c4338d006e9d7767276600c769993203cb0932aba8309f0c0

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