Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c4595458f79c2…

MALICIOUS

PDF

74.2 KB Created: 2021-03-01 20:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2c58949e9dd278270a10db55fe3921d SHA-1: 73487be8aa3df325e6399bb956ee9bb09f4f6d5f SHA-256: 3b8c4595458f79c2ce12ad5d0058e9441a6761da6ba823399ff1d73af359a6b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

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://jumiwimov.ru/award?keyword=what+are+the+elements+of+psychoanalytic+theory PDF link annotation
    • https://cdn.sqhk.co/xejudawadoni/1bJ3hgT/find_my_phone_samsung_galaxy_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_603d0ea502381.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/dggU5KN/cashier_3d_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/sagcidY/60915012907.pdfIn PDF document text
    • http://tesodip.iblogger.org/fifapiwudigegiwot.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/gcggRIG/at_t_u-_verse_customer_service.pdfIn PDF document text
    • http://misudijawalezom.22web.org/pojajibasigefip.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/haNGigH/xufova.pdfIn PDF document text
    • http://zazujig.22web.org/jumbled_jigsaw_reducing_fractions_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/jefadata/g5A8jaC/most_crazy_football_plays.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5ff8fd2f6cf5c.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/jhhjdI6/superstar_life_app_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajavipol.rf.gd/berenstain_bears_tv_show_theme_song.pdfIn PDF document text
    • http://setopuvoxuz.epizy.com/manitoulin_island_fishing_report.pdfIn PDF document text
    • http://vepilezora.epizy.com/75032441518.pdfIn PDF document text
    • http://mosaruge.rf.gd/miguel_street_analysis.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/topographical_anatomy_atlas.pdfIn PDF document text
    • http://merazajujivu.epizy.com/advanced_filter_excel_different_sheet.pdfIn PDF document text
    • http://remigesej.epizy.com/ladazuxupijelegag.pdfIn PDF document text
    • http://refepow.epizy.com/4011399842.pdfIn PDF document text
    • http://sezajebufixi.epizy.com/attendance_allowance_form_notes.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5372 bytes
SHA-256: 654356c4b09cca3630a9283229243149f05f73ff5d4c94cd8cb34680cbedab52
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 9712 bytes
SHA-256: cf86449979551490cdb8937cdddbae71c712ea8d540967144c3badbec9b5d7a8

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