Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f93a65f7dfef0b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-03 08:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c319159af697be41680fd9a20b7b2cc0 SHA-1: 52c50c07a1157d5224a0a4ee7fd38ffeff1b0f7a SHA-256: f8f93a65f7dfef0b8b4482ef9f4e750c21519251787c91cbba4de2d8de113e21
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest a phishing or malware distribution attempt, disguised with seemingly innocuous content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=how+to+open+kitchenaid+chopper+attachment PDF link annotation
    • http://fuxukibegub.iblogger.org/chigurida_kanasu_movie_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/icn40hh/bubble_tea_recipe_white_tapioca_pearls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fc8563ab9419.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/louise_hays_park_history.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/epythcP/ps4_controller_tester_mac.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/fiporam.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/mathematics_syllabus_for_jhs_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/giK75CK/copper_price_per_pound_fresno_ca.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/wuvoxujigutatolijebiki.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/axiom_pro_25_power_supply.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorewabamav.epizy.com/15041923775.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/what_is_a_good_thesis_statement_for_a_persuasive_essay.pdfIn PDF document text
    • http://tukudapig.epizy.com/tivorijoxoxalinavejuluxeg.pdfIn PDF document text
    • http://garulolit.rf.gd/76230514331.pdfIn PDF document text
    • http://mapamazimibodu.epizy.com/44724263404.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/selenium_webdriver_javascript_automation_for_beginners_2019.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/sekiro_shadows_die_twice_true_ending_guide.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/how_much_does_a_cfa_earn_in_south_africa.pdfIn PDF document text
    • http://tamoxadamajus.rf.gd/niwaregetofi.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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 5220 bytes
SHA-256: 7b69aae9058caa4ec6c9dd5e221d9dfef2ebc29b4eea416f6a41ee7a1080dc41
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10904 bytes
SHA-256: a02b130206332c640b13252a81d0887ec56ea9a967e74b1c1cf4a47541a861e6

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