Malicious PDF — malware analysis report

Static analysis result for SHA-256 0689d6426d58d57f…

MALICIOUS

PDF

124.8 KB Created: 2021-04-15 17:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c4b4e888a23be3b904d71f4e647dbb19 SHA-1: 461d5244d5ed2522d2da03a13567dc546ee4e097 SHA-256: 0689d6426d58d57fb9b4ad872a3aad5244d47a9fc5e0c55b3798f24e42d3e476
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'https://midufefew.ru/strik?utm_term=superstar+3900+service+manual+pdf'. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, designed to deceive users into downloading files or visiting malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=superstar+3900+service+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403824/normal_602178454dcbd.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/runir_deux_en_ligne.pdfIn PDF document text
    • http://trastqort.online/sap_bpc_10.1_standard_vs_embedded4ibew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_605cf8e938a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fe6fd86dc98b.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/rules_for_writers_8th_edition_online.pdfIn PDF document text
    • http://gogotmif.space/yaplarna_gre_sfatlar1mu77.pdfIn PDF document text
    • http://xurenaxifuz.iblogger.org/steuererklrung_2020_anlage_v.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/83731427749.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/37627238689.pdfIn PDF document text
    • http://pimegaxonubaz.22web.org/tixuk.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/redepagafitabo.pdfIn PDF document text
    • http://you-bestshop.xyz/gillette_styler_manual6kqxf.pdfIn PDF document text
    • http://lozolupamo.mypressonline.com/tenancy_agreement_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rulezowi.rf.gd/hp_laserjet_3015_driver_for_windows_7_64_bit.pdfIn PDF document text
    • http://wutogiku.epizy.com/building_information_modeling_for_dummies_download.pdfIn PDF document text
    • http://futivel.epizy.com/volaxuladakowunutopizazik.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/agreement_of_purchase_and_sale_ontario.pdfIn PDF document text
    • http://xusapibu.onlinewebshop.net/numeros_romanos_ejercicios_primaria.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/47782126610.pdfIn PDF document text
    • http://monufurojebuwod.rf.gd/halloween_math_worksheets_for_preschoolers.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/jerry_garcia_band_after_midnight_chords.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/39508057127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EDC 5696 bytes
SHA-256: ec1c9c26e4150a5fa8a69f737a5b91e33867468948ea5d55ee0713c99bd1f87c
font_01_sfnt_off0001b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B21D 11092 bytes
SHA-256: b21eaa6f3e946b3a7c4b20f9f472f149825759c13591e5c02ae39683c5f1025f
font_02_sfnt_off0001d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D719 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3