Malicious PDF — malware analysis report

Static analysis result for SHA-256 9803c17d9188da69…

MALICIOUS

PDF

80.4 KB Created: 2021-03-09 10:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4811f703af7c9d1a0286fa878db42b8d SHA-1: 2012edd538493a71ec59e39d15d5298b8e2d1bee SHA-256: 9803c17d9188da69a287083346d41f1e2dfdc8b4bd09518df495f40666349405
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and some to known malicious redirectors, indicating a link farm designed to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to lure users to malicious infrastructure, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=spreadsheet+excel+examples In PDF document text
    • https://cdn.sqhk.co/ruzudulo/Aicjaii/nukupebakuwifapekib.pdfIn PDF document text
    • http://alexsaf.ru/how_to_deep_clean_a_tub_with_jetsr7l16.pdfIn PDF document text
    • http://copyright-infringement.business/bapofumomelifoxeleyvu.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/jjeiahd/siegefall_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/ahjihsu/morosusim.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ajbnajf/the_best_music_of_70_80_90.pdfIn PDF document text
    • http://afracheat8.xyz/short_love_poem_for_husband_birthday5z6fj.pdfIn PDF document text
    • http://finansi-7.online/91300944909k4gpj.pdfIn PDF document text
    • http://ttttrrrr.space/what_is_a_project_zorgo8uibd.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/izZWJgd/super_patrik_1._5_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/ihAgjph/music_download_free_mp3_songs_app.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/fumuxikagudosazig866au.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/national_geographic_magazine_contributor_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_cd3beeb0b229480aa778a02d2d28e20b.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_9f2ebe5b6155461abd78abdbf5a285f4.pdf?index=trueIn PDF document text
    • http://gametusepezuka.rf.gd/84459689544.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f2511623930f430f8e18d4e250ad8d0b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 5008 bytes
SHA-256: ba0204daa265a6a071bb312af20f16301c719ff7b90a5904229193b885691717
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 10920 bytes
SHA-256: d0cb632bf19e3c3e507105c2adbbd3ea9b54cdfaf656ef5f87400309ab752576
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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