Malicious PDF — malware analysis report

Static analysis result for SHA-256 447b9894b5c72df5…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 04:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8664ce01d843b6748ab3344c36138091 SHA-1: 12061ccc39ced7815960de053c5c3a72e15fac1e SHA-256: 447b9894b5c72df5cde563fd2ce74483e147baa1fca687ffc115c8f4ebd5efc8
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=serratus+anterior+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/viwukepato/ltPggje/what_is_cuffing_season_yahoo_answers.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/46022261727.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/business_analyst_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/gSYgehc/normal_oxygen_levels_covid_19.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/reliance_company_introduction.pdfIn PDF document text
    • http://mutinujevax.22web.org/ropiwil.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/nt53ijX/67432581297.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/heRsljc/ladunubug.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/xgf7d4y/3d_pipe_bender.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/rugijonufogori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejebakaropa.epizy.com/10276022863.pdfIn PDF document text
    • http://sedilar.rf.gd/pastel_pencil_drawing_techniques_for_beginners.pdfIn PDF document text
    • http://jonegukum.epizy.com/vobejuzafap.pdfIn PDF document text
    • http://vixuzuvubus.rf.gd/80219399320.pdfIn PDF document text
    • http://witefuru.rf.gd/22122365079.pdfIn PDF document text
    • http://faxanudof.epizy.com/vodikizekoli.pdfIn PDF document text
    • http://jozazesebogole.rf.gd/report_types_in_business_communication.pdfIn PDF document text
    • http://fizixute.rf.gd/32923636706.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/bwv_999.pdfIn PDF document text
    • http://lufeneweb.epizy.com/best_hd_live_wallpapers_for_android_phones.pdfIn PDF document text
    • http://tuvawewopuje.rf.gd/rewewokir.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/dead_by_daylight_mobile_beta.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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5288 bytes
SHA-256: c3d15dad32a356c58a34b9f41aa36bac4531e888e937f00ba1c421d2ad702b0a
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10132 bytes
SHA-256: e43d23915c30bcdf76ea4c829bbda762dfa13ab063d699a89992e19105844c09

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