Malicious PDF — malware analysis report

Static analysis result for SHA-256 6888cca6ffe5aa0a…

MALICIOUS

PDF

78.2 KB Created: 2021-05-11 16:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 15abb22703568e4bf1e672bfcde3bed4 SHA-1: 22dc8f258613b7b0d6f71a7affb68600881e5135 SHA-256: 6888cca6ffe5aa0aeb9ad7a3e929659a72d21c3b16c96f3b2b2d3cb886069e11
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these malicious links.

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://soxebez.ru/strik?utm_term=how+to+prepare+garden+for+winter+uk PDF link annotation
    • http://xolokeminapi.getenjoyment.net/formasi_cpns_kabupaten_bandung_barat_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/tgh8jaB/79259132743.pdfIn PDF document text
    • http://zunowugijose.22web.org/livros_augusto_cury_armadilhas_da_mente.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/67047958529.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/placa_bacteriana_en_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/Iibsoji/neogeo_x_review.pdfIn PDF document text
    • http://lagegisujego.iblogger.org/biztalk_server_administration_console.pdfIn PDF document text
    • http://daxamel.mywebcommunity.org/analogy_synonym.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/hillsborough_county_schools_report_card_schedule_2018.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/bomuwizajakaxa.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/how_to_open_flash_player_on_chrome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_3e338345c97e4992b917c9c4fe99e5c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee793d62-52f0-41b0-bbae-c8c9e6b70dfc/bosch_colt_router_collet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb4c5c9-0e1a-4516-97c6-c301a76dc847/jumupetewomesu.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_b29731d366ef4773bfeea5c40d7d0d96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d6fac7-a9e9-4c78-a1ee-ef44bdc62d7a/data_science_salary_nyc_entry_level.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/how_do_i_set_my_armitron_pro_sport_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43844b73-2649-4a35-99a5-fa2eaa15c664/how_to_calculate_raw_score_for_sat.pdfIn PDF document text
    • http://sesoxevanadike.epizy.com/book_of_jasher_dead_sea_scrolls.pdfIn PDF document text
    • http://pefafimu.rf.gd/79137416460.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_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 5116 bytes
SHA-256: 25716a61401e131fca76646994f1c8b6437be6d2ee065af5fe8733248873eb94
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 11088 bytes
SHA-256: b7be5be6517e5db6597c42d7735080003c6b85f44edf9300958a61d066401b25

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