Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a549a9c9b48658…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 14:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b3785515cd209fc3f198831a732780 SHA-1: ea7178e9b997a0b15c30247aa51638dd70c2f3fd SHA-256: 67a549a9c9b4865806d7cb9c322c0ff353d430305275d44e2b70aba2c7163569
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=bardwell+f4+fc+manual
    • https://cdn.sqhk.co/bapuparit/Igezegf/29969133343.pdf
    • https://cdn.sqhk.co/lokutibu/OTvwhbm/north_arrow_autocad_blocks_free.pdf
    • https://cdn.sqhk.co/ragejeli/gvkUrhd/gogejetijigipukagep.pdf
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/vatesone.pdf
    • https://cdn.sqhk.co/wojusipi/wqjjjbu/super_soccer_champs_2019_vip_apk_download.pdf
    • http://zodimasar.mypressonline.com/nulasirimixevijarezot.pdf
    • https://cdn.sqhk.co/nupepewomaxu/ifVhds3/43643767276.pdf
    • http://rimiripa.mypressonline.com/the_road_not_taken_quiz_answer_key.pdf
    • https://cdn.sqhk.co/zijigemeworu/Z1hhgjo/53508197830.pdf
    • http://zikewexer.scienceontheweb.net/apc_smt1500nc_smart-ups_1500va_lcd_120v_with_network_card.pdf
    • https://jejaxeka.weebly.com/uploads/1/3/0/7/130739175/jopoxetijivuzuxuvag.pdf
    • https://cdn.sqhk.co/ninuxoti/XAk3tgj/fireboy_and_watergirl_online_2.pdf
    • http://sibatike.getenjoyment.net/aqua_pure_water_softener_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedimuta/74203700320.pdf
    • http://kavibajegis.onlinewebshop.net/how_to_get_gamestop_coupons.pdf
    • https://s3.amazonaws.com/gixirojozogufux/medication_through_peg_tube.pdf
    • https://s3.amazonaws.com/puretulenuza/haiku_stairs_guided_tour.pdf
    • https://s3.amazonaws.com/vuforewebub/waste_king_l-8000_reviews.pdf
    • https://s3.amazonaws.com/kotodur/free_of_betternet_for_windows_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58a.bin
cf548b3af91c528226ef9cb02b7e5d33791c796a04e8e4edd3024850aa46784d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5216 bytes
font_01_sfnt_off0000f751.bin
6d110c93428d2f9fca1e1539a235ad65796566d8c631cd92fdc82cb79b2fdedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 11400 bytes

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