Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f6daba6fea9585…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 17:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2033bfc304d34b55548c2835cc0c60f9 SHA-1: 8a8d200d09d2dc7ab0fc87a0aaa605734c7897cd SHA-256: 25f6daba6fea95858dfb76136ab73a6de57ae3e2efe8299ebd218e077181308a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO abuse pattern. One of the primary URLs observed is https://midufefew.ru/strik?utm_term=we+the+animals+characters, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=we+the+animals+characters PDF link annotation
    • https://cdn.sqhk.co/wugolekufo/f00JgdB/ringtone_download_mp3_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/i5hawgc/rebulowedas.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ZXdgeMu/power_media_player_update.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/ePjhs6Q/multiple_accounts_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/s4Wjd19/blood_glory_2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/fPgiRwB/types_of_fallacies_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/miajd2y/63664385379.pdfIn PDF document text
    • http://leledup.mypressonline.com/tajep.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/iiDjhjb/gotolixijibeguwotomazen.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/the_real_book_jazz_standards.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/fernando_pessoa_livros_em.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/does_roku_tv_support_airplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupepoge.onlinewebshop.net/bubapiguririnosujezidutex.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_5b99e23a1aad4e2e800f8044bfe574f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falufusu/jemasisisemodikopem.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/85919852960.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/different_types_of_spur_gears.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/48198258178.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/total_video_converter_for_windows_7.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_36e76f187ff14680a8050cf2daae7186.pdf?index=trueIn 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5052 bytes
SHA-256: 08058824f72d3c310dd6a8910bf7354db24cb0cd4d8ad14903da93dae4ca8f78
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 11612 bytes
SHA-256: f1a7c4fd9debd1ff35e21c33c738f211c30c4352def91b303d8037ce9a7e2a7c

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