Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe1eaf9791ee53c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 10:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 569fd4b969addbd119176d93e7662641 SHA-1: 22b8e8a2337b36185d1e519e4f4bcb68c2603b0b SHA-256: 4fe1eaf9791ee53c789bc97718dcaa75a90886e698ff5c28db941777be66b6f4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9990

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://druttle.ru/123?utm_term=che+guevara+biography+book+tamil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472501/normal_600a10a25c7f9.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/dRgeGja/26379255309.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/Nidjgjh/sound_meter_android_app_download.pdfIn PDF document text
    • http://spain50off.info/esv_study_bible_books_a_millionh2lgc.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/0gfAje2/doordash_stock_ticker.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/9hajfew/linux_system_hardening_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/ibggMgc/halloween_costume_ideas_for_couples_scary.pdfIn PDF document text
    • http://lifeshop.pro/979194018988ld9w.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/gfkdSy7/outlaws_dirt_track_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/dLKd5hN/electrical_lighting_design_calculations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_6049ed88a8773.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/how_to_use_houses_in_monopolyib4bm.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/gfheRyD/find_my_friends_not_working_in_imessage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_601ee263be76d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_e295cc8b4e574d2c89af112243fe831f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/371d5f78-012c-4078-bf3f-5c139b5d03ca/padomebaxanobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed618154-8a9d-416c-8f3b-02697f903363/twilight_breaking_dawn_part_2_watch_online.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4bab66e5f92244edbf1d5d26383e8752.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c11974-9fa4-45dd-921f-6ae067db657b/roxane_cyrano_de_bergerac_quotes.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_b72bc2306b4c4fa19ec535befdbc7fcf.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_732a14abefec4a3f84840def88745445.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5637dd9-ced1-4944-9fad-397040e5c238/pajuzuvezaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343f85a0-7a6e-4918-8e00-3ac0d454d8cf/mastercam_x5_lathe_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 5548 bytes
SHA-256: 3b294809e7e991aceb651583cf32ec712634bbb7faaf83a7746f0fd52a7977b8
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 3804 bytes
SHA-256: 0f812371b05cd80390984d86d58ae54b2c5d37d929de9616aec8f186f52ad6a9
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 10400 bytes
SHA-256: 0c2e550d5c50d796436d35ce99d1d563b932cad1107eecf386ca6b6d74288e87