Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7628655c5327f1…

MALICIOUS

PDF

84.9 KB Created: 2021-03-28 11:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 092f9f17f6e95b1f85dd05021c209212 SHA-1: a7e8fde470601526b0cb1826bc2bed72f581a23a SHA-256: db7628655c5327f1c7e44260c271fe1cd30bfd203033042ca503edb4fccc2bee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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://soxebez.ru/strik?utm_term=trx+training+band+workout PDF link annotation
    • http://bubobimurasawe.iblogger.org/cuisinart_air_fryer_toaster_oven_toa-60_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5fd3387196200.pdfIn PDF document text
    • http://mabobuluka.iblogger.org/biogas_plant_types.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feb1ae99cee1.pdfIn PDF document text
    • http://topplafond.xyz/chrysler_pt_cruiser_service_manual9z1f9.pdfIn PDF document text
    • http://lorenbayi.com/10622292699mmnux.pdfIn PDF document text
    • http://podemufibe.iblogger.org/vijoxebufafaxanam.pdfIn PDF document text
    • http://fujopijur.iblogger.org/paas_aao_na_song_pagalworld.pdfIn PDF document text
    • http://kleomaften.online/3432918053tvu0o.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/diabetic_foot_powerpoint_template.pdfIn PDF document text
    • http://nakanilo.club/asus_dsl-ac68u_merlin_firmware3xd83.pdfIn PDF document text
    • http://linza.media/la_celestina_resumen_por_actos_y_escenasgufb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajivuselome.epizy.com/rogukabukifajo.pdfIn PDF document text
    • http://wozunajovufati.rf.gd/green_day_basket_case_guitar_tab.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/frigates_fiji_surf_report.pdfIn PDF document text
    • http://zizajurowetomej.epizy.com/19265748119.pdfIn PDF document text
    • http://junotilunam.rf.gd/what_is_buying_and_selling_annual_leave.pdfIn PDF document text
    • http://jikatudito.rf.gd/computer_security_principles_and_practice_4th_edition_solutions.pdfIn PDF document text
    • http://mitadur.epizy.com/federal_cassation_decision_volume_21.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_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 5096 bytes
SHA-256: ea19b609a33fafa3aa39f03f78bd830d7caf163021d7ac421c20c619210c98cf
font_01_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10764 bytes
SHA-256: 138b1e39d79ab0647811f8251d179ece3b5b7b407f4e87d4cb31084a222238d2

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