Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f60b6a8b66a9945…

MALICIOUS

PDF

75.8 KB Created: 2021-04-11 09:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7f74946ab67fdd79710d8de3fbdbaccf SHA-1: 5df423fbd28361ec829fe132541ac3366d9fe84c SHA-256: 3f60b6a8b66a99453b47c24c8a86b429094b8cac39b49b858f71aabe0db56b64
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL pointing to 'zajinet.ru/strik' strongly suggest a phishing or malware distribution attempt. Although no scripts were extracted, the structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=words+that+start+with+a+to+describe+a+feeling+of+happiness PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fdf7ba119ff5.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/uifFhjL/playcraft_center_ice_air_hockey_table.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/kawamufifowepeburat.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/8Mxijjb/gixis.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/cancer_stem_cells_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/jhgcgfB/robots_coop_mod_menu_apk_1._3._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_601e12eb4445e.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/pupujarolulumup.pdfIn PDF document text
    • https://cdn.sqhk.co/jazumagefo/jbZUYhj/automatic_bing_wallpaper_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6042ed1819121.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/ggOjhhe/hay_days_2020_atkinson_ne.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/GGFFid8/flights_from_london_city_airport_to_dublin_ireland.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/laporan_pendahuluan_stemi_anterior.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/spotify_apk_mod_premium.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/kufosobivifi.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/siddha_lakshmi_stotram_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a024aa-5f39-4968-89a1-0327f6c2ac69/highest_paid_technical_writing_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/how_big_is_the_star_trek_uss_enterprise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626cb99e-7f50-40dc-9646-3ed86e078059/xomozilajefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc60b148-9d22-4f50-80cb-8599c6d5d8fd/sanowivuresanazemepilob.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/powermate_5500_generator_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e311da-f5f6-4255-9d5c-db3cb4c5b150/aja_ki_pro_ultra_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664e6abf-27b5-4ce5-99ee-7fd09ea75189/xajeledebudosunikisuvo.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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5664 bytes
SHA-256: 703abcdc9ee3d4a682a3b44a30dfa97406f28d1d1276ed244bd874653d0cffef
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10792 bytes
SHA-256: 05639738f15516ee6238d040c5ce635f1c0ca5901e4209f8e04c054ecd1e95ff

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