Malicious PDF — malware analysis report

Static analysis result for SHA-256 7829634c295a60c1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 12:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37e81c3f5d061c6a39cd7ffefc36b626 SHA-1: 969f647cb9bbbde037f02b06c8accf189e0b67d7 SHA-256: 7829634c295a60c1e3a47f8f68ef65f8c75e34c9e6add8d26358830b62745d1f
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 0.9997

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
  • 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://fokemale.ru/123?utm_term=back+wars+hack+apk PDF link annotation
    • http://sawemawe.mywebcommunity.org/how_do_i_setup_my_canon_printer_without_the_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/xarupozikala/gel8vjw/ateneo_de_cebu_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/Lhagdvx/does_nfl_network_have_a_streaming_service.pdfIn PDF document text
    • http://suxiselukex.66ghz.com/esl_using_articles_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/lbHBjex/ping_pong_table_dimensions_and_clearance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_604514bcd2ae9.pdfIn PDF document text
    • http://renawozalor.iblogger.org/jorerenafodotowixopiwum.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/1hjgjeq/fia_european_historic_sporting_rally_championship_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fe41d69e9dad.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/gduBijn/70775603582.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/8920413065.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/6igOphc/79868261540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_60326681d7556.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/2haShcG/octonauts_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ii1gdji/todo_list_application_in_asp._net.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/HUjbJij/64686316122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajukowopod.epizy.com/nelco_sewing_machine_price.pdfIn PDF document text
    • http://tulafixobokov.rf.gd/rigetabazogekagim.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f1281ac924b54147a1e6e76047817b18.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_976fff5afb38448fa7713f26ac80b832.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_7fc2171f1fa147d38ab6d7a3b9f112a4.pdf?index=trueIn 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_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5196 bytes
SHA-256: f46feb3fbceafc0d3f1f05e000423fe362a9f9c6328876d39fcd685e1bafd139
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 10640 bytes
SHA-256: 6aed1e3cb048e431e4fde6fed921873092fee94b77a00d67748b9816236d0b30