Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da689b32b10ce49…

MALICIOUS

PDF

70.5 KB Created: 2021-03-06 23:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 3d1d95af917db56b82dfd2f214d37a2c SHA-1: 61376f46af0bb3b16a7250cada521254893204d4 SHA-256: 5da689b32b10ce49fce15a7320d788956f074f0144ee6e81514a0cb958d0023b
66 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to 'kuzutuzo.ru', which is flagged as a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to reviewing a picture, aligning with the malicious URL's keyword. The ML classifier strongly indicates maliciousness, suggesting the primary goal is to redirect users to the suspicious URL, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=how%20to%20review%20a%20picture PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5fd806d946345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fde4e6ccaf81.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/pikilasavo.pdfIn PDF document text
    • http://canonsburglake.org/android_pc_synchronisierenep47q.pdfIn PDF document text
    • http://checkmyscore.info/jedejigeteedaw8.pdfIn PDF document text
    • http://topsalon.xyz/biwisubusegudunivebell8nw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_603828c9e23e6.pdfIn PDF document text
    • http://smcjd.com/lazodutewefefoxaru6v600.pdfIn PDF document text
    • http://clyb-wylcan3.space/porajosapufojuredawilr5pcu.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/adding_admob_in_android_studio.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/fleck_5600sxt_programming_instructions.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/tobaziw/books_to_read_after_fifty_shades_of_grey_trilogy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f029b6-66a4-4d49-9f90-0f0eb05bcfeb/dagobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d93768-5c2a-4da3-9eb9-f1743f105f3c/asmaul_husna_yang_artinya_maha_esa_adalah.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/uk_map_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/blade_master_mod_apk_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d63e24e-21de-475e-b88b-997265674025/garmin_epix_gps_watch_topo.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/torotatojukagudekazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ada16bf-a8bc-4f90-8a76-41463738d95f/resug.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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 4832 bytes
SHA-256: 2825348075adeebff5d1691bfd4ff301c8938e4cbde7f3e56160890177c14077
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 10500 bytes
SHA-256: 60aea2b85249112aa2c01d7d64c480533fad7a55b4e4e911026ff4b44372e933

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