Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a42f4b6ba80cacc…

MALICIOUS

PDF

75.3 KB Created: 2021-04-12 02:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47b6a1e76f6e4de3cd14d94e2c8818ab SHA-1: 088e0f734c39a6696b86b9a3d38eb4eaa3720ea6 SHA-256: 4a42f4b6ba80cacceb967a509830f60af19e3f596e17ab79afb1833cab171924
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=how+fast+is+aerosmith+roller+coaster', which is presented in a way that suggests it is a search result, aiming to trick the user into clicking it. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing or redirection campaign.

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://resalured.ru/strik?utm_term=how+fast+is+aerosmith+roller+coaster PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369493/normal_606e5739b3542.pdfIn PDF document text
    • http://distornyup.site/19856447188492q9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fce99b90dd91.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/igdgjjg/axios._post_form_data.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/ig1hdhf/rajesex.pdfIn PDF document text
    • http://kanshoper.site/cropped_shirt_jumpsuit5833p.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/dBjahad/the_hangover_2009_ok._ru.pdfIn PDF document text
    • http://winoorama.fun/lomubedobiwekigamewuwamitj8a.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/56755753473iaiyt.pdfIn PDF document text
    • http://liketime.online/38550109877vaugf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_601a16ff02871.pdfIn PDF document text
    • http://itanto.space/75632423772ynowh.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bP3zala/kapuxedawakenagadeg.pdfIn PDF document text
    • http://gufutaca5.xyz/us_gaap_20209ufum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/21085018160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4350c468-e10a-438f-bf45-8b2344ffd337/how_to_turn_on_majestic_gas_fireplace_pilot_light.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/que_es_el_local_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a2933d-1987-4e88-8104-b8866159d176/how_to_add_files_to_your_wix_website.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/37938279743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8060683a-6cf3-42c9-9266-acf1f651f6f4/how_to_connect_hp_laserjet_p1606dn_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491edeaf-ebfd-4b3b-84c8-40e3ba43e067/which_fios_ont_do_i_have.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_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 5172 bytes
SHA-256: 126d78d42b885aa988f7a377f0026aa80b8d6e09565bbd31dbf01e3f188cf795
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10716 bytes
SHA-256: 790f6293178c6738172fafe3e0418eac6f23b2658d41eb82c4d168e238eacc3a

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