Malicious PDF — malware analysis report

Static analysis result for SHA-256 263bfd48a4d9c8fc…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 15:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e187eb3ab02cf3973a9fa7e9816739ac SHA-1: aba8cc90db03227206b9ab007d9e7a583ea4b94d SHA-256: 263bfd48a4d9c8fc9f7c049842517343b547e94203004552f9febc36eaa1d47a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/strik?utm_term=derechos+humanos+concepto+pdf In PDF document text
    • https://cdn.sqhk.co/fuluzagile/eijG3gj/zomowamanit.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/lgdVqW4/sisters_thai_fairfax_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/Fhjji26/monster_castle_level_pack_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/gf1ific/nick_jonas_wife_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/ZnyRIhj/boy_over_flower_2.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/83572389288.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/cBhfUji/sebexotetewuwexuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ggoghYZ/pemomuwupax.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/brandy_melville_free_shipping_december_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/bhbxhcH/xojanoxududilofebe.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/kAhheje/72222892146.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/jgAhaEV/air_traffic_controller_jobs_england.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_e651e5b6010e4da8a8c982d665a559ac.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_6f715a38782e46bba1a8cc6f53b28f18.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_a6bbc448d7b14e44b0d1dfc58dcf4f3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0007b6da-f526-4200-b165-8dcaa2d5d9fc/how_to_get_out_of_monopoly_jail.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_9dc91c9898aa4261b029fd35cd2d7756.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_90f945cba814489f92acd0d6db5d295a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567bc600-220c-41bb-adf4-72b46e45967c/general_chemistry_petrucci_10th_edition_solutions_manual_free.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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 5360 bytes
SHA-256: 9963f1b930717e34f9ba3b1322b0b268130df67f41bc0d4fc89dea6ebd7f9f06
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 12088 bytes
SHA-256: 97203cc754d969fb437f9c54e33f3bf9ab21f0750d11bd56ccf30b616e1de477