Malicious PDF — malware analysis report

Static analysis result for SHA-256 825ce84e0b4b9cdd…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 07:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 37a298a23a1e00ea4e314ac4acf48b39 SHA-1: d2b97cb9bad6db35e969dc0b5c06faddbba2c8ef SHA-256: 825ce84e0b4b9cddd6a418755cfe57507f6725b96b6b3c79b9e2c02f05031e23
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains multiple embedded URLs, with one pointing to 'pelibifir.ru', which is associated with phishing and link farming activities. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely as part of a phishing campaign or to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=enlightenment+now+pdf+pinker PDF link annotation
    • http://kafojiv.iblogger.org/editorial_design_portfolio.pdfIn PDF document text
    • http://gerda-msk.ru/50167828029244eo.pdfIn PDF document text
    • http://sexedate69.site/nuwifezijedojowpfc0.pdfIn PDF document text
    • http://ru-1.casa/raruzetidadutuvaudo.pdfIn PDF document text
    • http://axecheat9.xyz/23213765296hb6t4.pdfIn PDF document text
    • http://jetiloxabutu.iblogger.org/capillary_electrophoresis_methods_and_protocols.pdfIn PDF document text
    • http://rivezetufizi.iblogger.org/chamelephon_apk_for_mtk.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/3f0e493d-3b42-457e-974f-28f46c3b1279/sibesixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3cb4e6-5b70-4e24-b6d6-76c596f5db83/traduo_da_musica_7_years.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/holika_holika_sheet_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/gomoxagupeludejodub.pdfIn PDF document text
    • http://tidomag.epizy.com/car_games_parking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad78be0d-f0d5-4072-ab8c-abdf08e77e3c/where_the_wild_things_are_songs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/breadman_plus_bread_machine_instructions.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/totoker.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/nshield_connect_hsm_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d491ca5e-7db9-4db3-aaf0-eddced6dfed1/kufudafejalezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46166fc2-3172-48a5-b713-10ebab7f0f9a/keurig_2.0_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04953458-bece-4eab-a55a-d57eb127823e/28641536069.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_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 5180 bytes
SHA-256: a652b38b86e7411a97cfd525113c443f59030b8a56fef217bbc127f904936d71
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 11248 bytes
SHA-256: 7c059742b8c0defff6f6de1db9d5a260c6002f797d780128c95eb0c325c92aaa

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