Malicious PDF — malware analysis report

Static analysis result for SHA-256 492dba62d53db7c3…

MALICIOUS

PDF

83.3 KB Created: 2021-04-22 07:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e652f43e07725d1da9160e7d4e8fdff SHA-1: 9179614399a55d2918f39a68799b48eeb4910025 SHA-256: 492dba62d53db7c365ac86aa39ff78d804ea63b8e8eb9347746e3af597b20bff
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://seumenha.ru/strik?utm_term=is+the+selection+series+going+to+be+a+movie', suggests a lure related to movie search results. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the document's structure and URL distribution point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=is+the+selection+series+going+to+be+a+movie PDF link annotation
    • http://nefuzixitelu.iblogger.org/the_collection_movie_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/hduviav/road_draw_2_moto_race.pdfIn PDF document text
    • http://xigesoti.iblogger.org/free_download_hp_deskjet_9800_printer_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/rhh7uPr/uno_card_reverse_cards_uno_rules_game.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/nolog.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/29035546934.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jajcgVK/best_movies_2019_imdb.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/58517860307.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/botany_syllabus_for_ias.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/87588990715.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/certificat_de_cession_vhicule_gratuit.pdfIn PDF document text
    • http://zixudisomiv.22web.org/alexandra_david_neel_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogeguva/hillsong_almighty_god_my_redeemer_lyrics.pdfIn PDF document text
    • http://fositelorefux.epizy.com/kensington_mouse_manual.pdfIn PDF document text
    • http://taxolume.rf.gd/73499904855.pdfIn PDF document text
    • http://limazajot.rf.gd/pizigaxexozewe.pdfIn PDF document text
    • http://mulusatore.rf.gd/98620459380.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/22842683079.pdfIn PDF document text
    • http://bavolimusasivan.rf.gd/dulefosaf.pdfIn PDF document text
    • http://latilofu.rf.gd/81451060968.pdfIn PDF document text
    • http://nobixemoxuf.rf.gd/a_practical_handbook_for_the_actor_bruder.pdfIn PDF document text
    • http://valodabopovox.rf.gd/pudibogevufigemogaxikivi.pdfIn PDF document text
    • http://julisanusifi.rf.gd/hebrew_word_study_chaim_bentorah.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/ashampoo_free_1._0._7.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_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 5352 bytes
SHA-256: 342afda32ef26ea9a14127b3ed8c5bdf1ba05354f5f2835699da25960229cc82
font_01_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 11624 bytes
SHA-256: fb8df15bfcad2b948a91d367aba4dad291dc92ced9a36b4a336bf75bf8e013f9

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