Malicious PDF — malware analysis report

Static analysis result for SHA-256 164f63fcf4f23027…

MALICIOUS

PDF

76.3 KB Created: 2021-05-03 13:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c045909a4d925c02eaf0e44ade6bc58a SHA-1: 28afae2db3361deea6c821a2b1e0b81c5064de61 SHA-256: 164f63fcf4f2302724201dec66632987e2fc3093b804d4d1a31438f2479703e2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering tactic, specifically a browser extension or update installation lure, to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is part of a link farm designed to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dugedepap.ru/strik?utm_term=dsc+1832+partition+code+programming PDF link annotation
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/girejafagojixuvi.pdfIn PDF document text
    • http://mulolivenakafu.iblogger.org/5570654840.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/x7ihibs/61218152828.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://vusejulene.iblogger.org/last_lecture_by_randy_pausch.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/DcHichi/clash_of_clans_base_th6_farming.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/timegimozomij.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzijaxab/jgfmVdF/99053514414.pdfIn PDF document text
    • http://kwini-fini.online/bloomed_gelatin_sheets0kv5u.pdfIn PDF document text
    • http://gavojutopubiri.getenjoyment.net/bsimm_9.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/pumivekogogim.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/rih5gi0/losazawolorujawataviwad.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/3IVNihA/free_gin_rummy_plus_coins_easy.pdfIn PDF document text
    • http://copyright-central-media.com/how_to_get_veteran_on_drivers_license_floridakugo2.pdfIn PDF document text
    • http://lanufutado.22web.org/libro_hoffman_algebra_lineal.pdfIn PDF document text
    • http://good-production16.site/2017_lexus_rx_350_lease_dealsj2i1t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapafat.rf.gd/28_day_banting_diet_plan.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_95d1a415bdfd47bd92bd19a118e1ad50.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/snap-on_solus_edge_update_cost.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_03c1d0a5f3dd4375817731f7832f8374.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_9a1835b213654f9d9624ceda691e539f.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/26127447937.pdfIn PDF document text
    • http://vokotikif.epizy.com/rational_root_theorem_examples_with_answers.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_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5904 bytes
SHA-256: d6f0bf3167434065b01dea265755ee15e315ce30018acefe159eec2aaf314e57
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10396 bytes
SHA-256: 353d7b2aa729a9ac917d241028dd5682312aa8aaf986c9dde490d6ca1eedd569