Malicious PDF — malware analysis report

Static analysis result for SHA-256 77472b7403b5851d…

MALICIOUS

PDF

84.3 KB Created: 2021-04-19 21:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ed3c54789dc47694b89075c4c0581511 SHA-1: 27e138f5236c213e2c138c8699513490768c18a7 SHA-256: 77472b7403b5851d076530b82356c9c4a9409bac220b2fcbed190b44fdc2d602
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to external websites, with at least one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall detection suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://xajibur.ru/strik?utm_term=python+for+loop+list+length PDF link annotation
    • http://swiss-gear-top.xyz/dovovawesepolafataranuf8ggyk.pdfIn PDF document text
    • http://domsale.xyz/ti-34_multiview_texas_instrumentskof5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60184eccef5a4.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/sources_of_contamination_of_water.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_600f80c52a91d.pdfIn PDF document text
    • http://mebotus.mypressonline.com/acrobat_editor_free_download_with_crack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_604cdeb7a40fb.pdfIn PDF document text
    • http://mx50off.pro/9338540922189sts.pdfIn PDF document text
    • http://gaxopuxa.iblogger.org/watif.pdfIn PDF document text
    • http://accueilcmb.com/saxafasosibetafajukemtoxq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_5fe774003bafa.pdfIn PDF document text
    • http://reassurez-moi-fr.info/sadlier_vocabulary_workshop_level_b_answers_unit_4rgaox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5fec3acd46be9.pdfIn PDF document text
    • http://biomanix.best/seledesotaxizokuzakr9n8.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/how_to_set_stealth_game_camera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumisalozik.rf.gd/nofunosufofomito.pdfIn PDF document text
    • http://meguler.rf.gd/87752276011.pdfIn PDF document text
    • http://zagupijalixi.myartsonline.com/61137197147.pdfIn PDF document text
    • http://mujusitajal.rf.gd/pathetique_2nd_movement_sheet_music.pdfIn PDF document text
    • http://gikasabedadex.rf.gd/28048534182.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_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 5056 bytes
SHA-256: 1f52a32e2ef29a02638b5a1994a34cbc206a3bbb7c4b63324ca2da9df4537b3a
font_01_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10772 bytes
SHA-256: 05f9bcbe6103d78585023b19c0ec75ec4988b3532a534f3b1344203104ecf003

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