Malicious PDF — malware analysis report

Static analysis result for SHA-256 099b90d1cc62c91a…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 00:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 254635093c19fb083f7bc07f3a46f243 SHA-1: c51fb8ed643c00167be07ef1cdd7eef01c7bb3df SHA-256: 099b90d1cc62c91a2de1e126249326498db0ccba276f3ebb334ace5a1213e3a5
124 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains links to known malicious redirector infrastructure. The document appears to be a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious websites. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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 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://yafferge.ru/award?keyword=%25D0%25B8%25D1%2581%25D0%25BA%25D1%2583%25D1%2581%25D1%2581%25D1%2582%25D0%25B2%25D0%25B5%25D0%25BD%25D0%25BD%25D1%258B%25D0%25B9+%25D0%25B8%25D0%25BD%25D1%2582%25D0%25B5%25D0%25BB%25D0%25BB%25D0%25B5%25D0%25BA%25D1%2582+%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+pdf In PDF document text
    • http://nurigoluda.mygamesonline.org/cambio_climatico_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/4iibxji/abstraction_in_mathematics.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/jbHiapA/metformin_1500_mg_pcos_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/chDAOic/beyblade_rail_rush_battle_set_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/ghhLrib/electrician_apprenticeship_program_eugene_oregon.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/career_path_finder.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/17810162817.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/emhbjjr/zibafovofuxi.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/77406445273.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hg9rsjc/dictator_telugu_movie_2016.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/falifusivasoxujunono.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/gh4iahj/mr_bullet_too_many_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/apwiegi/competition_corner_dutch_throwdown_buddy.pdfIn PDF document text
    • https://cdn.sqhk.co/bodosuruwalu/jeRidjd/61248423587.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/he0teja/gestion_de_pme.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/dell_venue_8_pro_t01d_android.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/82500051316.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/Kcyhghh/66014106564.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/1UBgi5B/74219240680.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/lorifumofelu/bible_quiz_on_genesis_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/lucid_dreaming_guide_wild.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/watch_fantastic_beasts_and_where_to_find_them_online_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/hall_ticket_tnusrb.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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 5816 bytes
SHA-256: f3875fd8f82381a9a1c07c23fed19c79bba0be81b4ba3351d703af3b1dd75616
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 15808 bytes
SHA-256: 3ff1d92d43293feaa0ea9c7246efb083f87615e9e263c99b4ee639f77bc7865e

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