Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6860f73a8603eaf…

MALICIOUS

PDF

76.0 KB Created: 2021-04-24 09:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32c4c5fb5d7e3edbd7cdb2ab40f2edd7 SHA-1: 5445f843a995e275c2a1c616ef8eb22c25999c7c SHA-256: c6860f73a8603eaf52d8e8ac8c4f80357133c509b5a256747a7854c08953acda
106 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. 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 0.9997

Heuristics 5

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/strik?utm_term=how+to+add+network+drive+cmd PDF link annotation
    • http://marinarus.space/manual_de_carreo_gratis_completo0s9yk.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/dewalt_miter_saw_12_inch_manual.pdfIn PDF document text
    • http://compte-cmbretagne.best/ap_psychology_midterm_study_guideh1acp.pdfIn PDF document text
    • http://bu-markett.com/fosegufirawuvitqp1cz.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/bikini_body_help_nutrition_guide.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/vubeg.pdfIn PDF document text
    • http://ritual-venki.online/270_derece_dndrme3autu.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/figenugerira.pdfIn PDF document text
    • http://bullbananavannaone.xyz/turowemoladinudawagdcpgs.pdfIn PDF document text
    • http://reweder.site/the_art_of_happiness_chapter_2_summarydyt1g.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/50289171-e30a-432a-a830-8f054d11eb14/sogixupedoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce75269-66e3-4246-86e9-75290e6ca348/sajigewakidazidisinom.pdfIn PDF document text
    • http://xifebudi.epizy.com/rj45_crimping_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac90d26-c333-44b1-a4c5-64fac43bd800/bobux.pdfIn PDF document text
    • http://tulafixobokov.rf.gd/rigetabazogekagim.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/small_business_management_book.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/ledikezuxigena.pdfIn PDF document text
    • http://pisufomix.epizy.com/days_of_the_week_flashcards_printable.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/world_pool_association_blackball_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b70c7b-1a9a-48cb-bc91-096d6cbf6248/speed_queen_commercial_washing_machines_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40ad9b7-f861-4bb0-bab4-315f7e1c97d2/austin_j.l._how_to_do_things_with_words._1975.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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 5052 bytes
SHA-256: df836587b359ccfb9ee495c0829297581e411255aa518720c0f79654381de74e
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 11804 bytes
SHA-256: 511056243958200154f34403e2c36b572b362b821776ad6a5efd24b3083fe126