Malicious PDF — malware analysis report

Static analysis result for SHA-256 a691c0227861b5bf…

MALICIOUS

PDF

83.4 KB Created: 2021-04-18 22:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 283a1e8ecdc8636030cfa0d9f3e2ce85 SHA-1: 7c4a6bee5d51281d750d01e8dfa2e68f6d01de0e SHA-256: a691c0227861b5bf9d99a8f440eed28c84d5b5976a774895c94f759e29b9432b
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, and it embeds numerous URLs, many of which point to disposable or suspicious domains. The primary attack pattern appears to be a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=chronological+bible+reading+plan+old+and+new+testament In PDF document text
    • http://sis-paypal.com/commodore_64_value_ukmvezf.pdfIn PDF document text
    • http://siwerosagupakuv.22web.org/29278642789.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/sutaxia5k1r.pdfIn PDF document text
    • https://dukagalirizaz.weebly.com/uploads/1/3/1/8/131856141/278c5f.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/1659504.pdfIn PDF document text
    • http://kugoramex.iblogger.org/25085722778.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/fapesivus.pdfIn PDF document text
    • http://cmbmarketing.agency/64354915098aqojg.pdfIn PDF document text
    • https://zudesamuz.weebly.com/uploads/1/3/4/6/134689191/peparoxuboligeruk.pdfIn PDF document text
    • http://sexekovowo.iblogger.org/arap_bahar_libya_k.pdfIn PDF document text
    • http://pornbustyvids.com/685872156168vnrh.pdfIn PDF document text
    • https://kajabukege.weebly.com/uploads/1/3/1/3/131379037/5ba431d10d7918b.pdfIn PDF document text
    • http://flowerport.market/run_vba_code_in_excel_onlineuh122.pdfIn PDF document text
    • http://gomotejux.iblogger.org/mejenifenego.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/87086dc7-90da-455f-9688-ac7064ce21fe/julatadesodonovikora.pdfIn PDF document text
    • http://xawuxona.epizy.com/98113969430.pdfIn PDF document text
    • http://lasedunagikosu.rf.gd/what_does_ec_mean_on_a_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df22092-03dd-4d70-82e3-0fa577b6d51d/what_is_the_setting_of_araby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74c9663-cbaf-46b8-8459-941cd19bf5de/53055392837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d0e709-7e12-4a30-b895-8d40b6723272/29125231940.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/keditozosape.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/spinal_stenosis_nhs.pdfIn PDF document text
    • http://pezedavepajizum.rf.gd/jorenuxurinopubaligoxi.pdfIn PDF document text
    • http://giduzorim.epizy.com/gibogiguwipidapej.pdfIn PDF document text
    • http://jukaxifowiju.rf.gd/sql_join_multiple_tables_with_conditions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c2fba2-da69-4646-9de2-fe5b3db48998/spektrum_dx7_discontinued.pdfIn PDF document text
    • http://zanavaf.epizy.com/steam_link_android_mouse.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_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 5624 bytes
SHA-256: 8bd36e884dfada570253fb328700be92f5e79b356ded90c78144552e8b5bab10
font_01_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 10976 bytes
SHA-256: 249ef2682ea8f8664bb38e43de4a8204526d9810dd93958faef23bf950451795