Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a5d6cbb4357d92…

MALICIOUS

PDF

78.6 KB Created: 2021-04-08 00:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd37ef117445a1ed9fe50decb59ab6ca SHA-1: 87c895048855146ea20920078b336e3c2893e106 SHA-256: 64a5d6cbb4357d92dab5beeb27a62766b65ca2336cc45d3dacfdfd606218bfab
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/123?utm_term=brave+new+world+pdf+chapter+12 PDF link annotation
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/32c65a36d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_6008733d099da.pdfIn PDF document text
    • http://fofafik.iblogger.org/98144739648.pdfIn PDF document text
    • http://dolagamozelo.iblogger.org/the_thrill_is_gone_lyrics.pdfIn PDF document text
    • http://detonic-de.website/juworuvebukewofoher.pdfIn PDF document text
    • http://blablablacar.online/7251660922lfaz7.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/1166c9.pdfIn PDF document text
    • http://tewavel.iblogger.org/appion_g5_twin_rebuild_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_60142e9b2dffa.pdfIn PDF document text
    • http://reduslimitalia.site/final_fantasy_dimensions_fusion_abilities84io3.pdfIn PDF document text
    • http://copyrighthelpptteam.com/mp3_download_manager_mdm_indirxpozp.pdfIn PDF document text
    • http://bepajizijuxiz.iblogger.org/26498133369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_604eadd3e08d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eca179-b4a4-444d-96e5-506c5c2b3ff5/the_norton_anthology_of_world_literature_shorter_third_edition_vol._2_ebook.pdfIn PDF document text
    • http://jarunotaso.rf.gd/79757200640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a810b34-28ae-4bfb-9c9f-d672049b05b7/zobazagasudekowekejanaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c202246b-6fcd-4efc-9a0f-48709f9fa28a/kefajituguvabutudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87330824-ae5b-4d93-91b6-82cc035343a8/what_is_the_top_speed_of_a_dodge_charger_scat_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd02876-6c24-4799-ae35-0d9a35a88404/gobixofiret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07539639-fe5f-4498-84b4-f0da99a9025a/46250932226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d67bcce-e5cf-4e8d-b55b-2e7fe43bbd38/why_is_my_dell_latitude_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e20562e-e6a9-41f9-8c52-e19940b751ad/50579448682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b3d466-777c-4616-bb68-12a823c869dd/the_stand_2020_season_1_episode_5.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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5452 bytes
SHA-256: ea078a52d9230535299933cb05744a88b2c389687c7880f9a9639b337968d237
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 10032 bytes
SHA-256: 8e8f163f5dd3a25cbf098c1b9ae6c5a32c99447b5cb3459fbfb7d42e90f4f035