Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f09b23f23a76d3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 04:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b04098db5b6a6f3afe2b9005a5116ae SHA-1: abe427c57d6f7ebbf2dae4cb81387687b33114a2 SHA-256: 82f09b23f23a76d39f4d217e2440305f9c5d0a182b03bc69692002e5c28241ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, particularly those on disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=embroidery+books+for+beginners+pdf PDF link annotation
    • http://wonuwomola.iblogger.org/fobolinarufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_60198738dcaa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60369c7fb8341.pdfIn PDF document text
    • http://tigimurudel.22web.org/sutoloz.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/all_discord_hypesquad_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6012e3df793b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_6009a9036ceb1.pdfIn PDF document text
    • http://xovuwut.iblogger.org/luronanem.pdfIn PDF document text
    • http://jerunurijo.iblogger.org/44065602050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6012c30343cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fd3ba1651678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxuramubot.epizy.com/interview_questions_to_ask_nurse_manager_candidates.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/exercise_past_perfect_tense.pdfIn PDF document text
    • http://vefetoj.epizy.com/kezizefa.pdfIn PDF document text
    • http://fukorow.epizy.com/informal_letter_writing_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f6be74-3393-49c2-b64d-36b75fdebd60/dogilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc99e4f-5343-44e5-9558-07e5d6749ab2/ponazudimofagomed.pdfIn PDF document text
    • http://ratamam.epizy.com/ap_seminar_iwa_rubric_with_scoring_notes.pdfIn PDF document text
    • http://pimesunuxafo.epizy.com/duvovamazaguxowerosatu.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/que_es_el_conductismo_psicologia.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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5384 bytes
SHA-256: fcd557e6c209cc9902de7976f101f301ddcdadeb8c88133bf723546516049bf9
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10204 bytes
SHA-256: a2c9a0e56b86055dae88d11d8a5b5cdd7dfc99545c2ec82abf904e76b739b3c9

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