Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64a794d70b9794e…

MALICIOUS

PDF

82.7 KB Created: 2021-03-10 01:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103e029a5e4f2a4f669384903d18389f SHA-1: 2bed4a117cbade220a2d6f159d286ee5d1793bf2 SHA-256: f64a794d70b9794e110ca355906c896d0ac0957180aaf7c7328a3776bb33b033
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to 'clue score sheets' and application metadata from wkhtmltopdf, indicating it was likely generated programmatically to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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=clue+score+sheets
    • http://beamorem.com/australian_visit_visa_form_1418mosxa.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6031bead2a46d.pdf
    • https://cdn-cms.f-static.net/uploads/4427528/normal_60273527a9d41.pdf
    • http://francobusiness.com/95162053053f2rw4.pdf
    • http://nesobaka9.xyz/ursa_mini_pro_user_manualtagg9.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60271fcab288d.pdf
    • http://leadtop.co/best_movie_maker_program_for_mack74vd.pdf
    • http://girlita.space/weber_carburetor_manual687tq.pdf
    • http://whalesqpa.fun/libro_seduccion_jodi_ellen_malpas_deztf5r.pdf
    • https://cdn-cms.f-static.net/uploads/4454668/normal_603531b22d6da.pdf
    • http://republvinb.fun/hampton_bay_oil_rubbed_bronze_ceiling_fan_light_kitzqvzj.pdf
    • http://znakomstva18x.site/cisco_linksys_e1200_setupsrw94.pdf
    • http://supernefritroller.xyz/953595127485q0xe.pdf
    • http://kinoogf.space/don_t_touch_my_phone_wallpaper_for_girlskmzmb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/welanisowari/como_sacar_una_fotografia_digital.pdf
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_02a18d9600f9446ca3c036f7437d22a5.pdf?index=true
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_4a624348c5844b8299f5aa1024474efe.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_fec8e5c48a344cbfbc15d9b61f0397b7.pdf?index=true
    • https://s3.amazonaws.com/nisiwanolom/zumamemodiz.pdf
    • https://s3.amazonaws.com/tixedujegibex/cycle_time_study_excel_template.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_166a5ae1df9744b68c5f9d625749c7e8.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/bombay_velvet_full_movie_coolmoviez.pdf
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_5492f7a3c36842e1b279b3ae65c59cf2.pdf?index=true
    • https://s3.amazonaws.com/xefejevife/apache_tomcat_9._0._14.pdf
    • https://www.cancer.gov/coronavirus
    • 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_off00010776.bin
371a0a94e6bd6e416b4b0bd8154324be65e6ab79ec04b49ff2373f9e9384fee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 4584 bytes
font_01_sfnt_off00011701.bin
a5c6396013241cf06370b7e5d1c477d6c3ecfc5169babaec289efec219fbe15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 11320 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.