Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbde46252923377d…

MALICIOUS

PDF

104.1 KB Created: 2021-03-10 12:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 91596c0c41f7b1b74b56bd19103c5e83 SHA-1: 4b58104c001fe8105f76f11f45b472a44c945ff8 SHA-256: dbde46252923377d951983d1d7778414089a5e7f4525079261779947dbebaf5a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, with at least one pointing to a suspicious domain ('xajibur.ru') that is likely used for phishing or to serve further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=monster+inc+cast+names PDF link annotation
    • http://zovitidagawas.sportsontheweb.net/48884976560.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/metro_2033_last_light_redux_trainer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fec0b1d72537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fe7d5fe21248.pdfIn PDF document text
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/jimakisamolade.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/70551166598.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/1813656.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/where_to_buy_garmin_etrex_30x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_602e5c774e071.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/lumizenexozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_5fe8111bd1868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_601dfaf5cf649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/linear_approximation_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a52155-6901-4186-8884-fcdb1559b5fe/84166552624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645cf290-c74f-48f0-8cb0-8f83fa099096/3000_common_english_words_with_hindi_meaning.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_does_a_60_hp_mercury_4_stroke_weight.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/48953793477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c84f141-f90f-432d-81cf-3ac19e12112c/www.q-see.com_support_en_espaol.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/how_to_return_to_sender_post.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/human_resource_management_ppt_template_free_download.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_off00015e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E46 4916 bytes
SHA-256: 3624ccbe5927ac81ef557117c821cab29175b6f1503d82f78636bea3240e8039
font_01_sfnt_off00016ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF5 10856 bytes
SHA-256: 218834e586d9c878c78912d90b3b7beed9457095660089f590bbad2a602cf5d5

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