Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f39a4b69117f02…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 19:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 78678767a7370441f52b8d822d76dd39 SHA-1: 4b654fe6daa9d97fdd99538927b29ce23a9d9e0c SHA-256: c0f39a4b69117f023cce2f0adec094fff1841f8e91e3b8b251e33f9f58523dc4
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm this behavior.

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://dugedepap.ru/wix?keyword=flooring+saw+blade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501993/normal_60492ea87c9c7.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/concept_10_air_conditioner_capacitor.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/what_is_the_lord_of_the_rings_about_quick_summary.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/lg_washing_machine_wm2101hw_parts.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/dir_655_speed.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/argumentative_essay_about_internet.pdfIn PDF document text
    • http://faloken.22web.org/revolivaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fe10f6f424c7.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/how_to_get_more_heat_out_of_a_wood_burning_stove.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/system_programming_assembler_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a32d686a-315b-4216-99c4-01ffb5aba667/varomojex.pdfIn PDF document text
    • http://lelirovosas.epizy.com/kerisirepu.pdfIn PDF document text
    • http://wetotuwukututun.rf.gd/37808077294.pdfIn PDF document text
    • http://mabezaze.epizy.com/xixilajewovos.pdfIn PDF document text
    • http://tavejetenugaku.epizy.com/an_anemometer_measures_answer._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2486b5d8-1d82-4820-af14-2d3a3ddad6a4/95591598954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a074232d-4c29-4c6b-b4f9-ced2947736c8/call_me_by_your_name_script_to_screen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 4888 bytes
SHA-256: a1797513d6046c97907d3d94b652cc49530a3cfe4cdb37ddd858206759bc6194
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 11408 bytes
SHA-256: bfc66be205e9fc96528dc71d356b461960b8a31484243ab37b42a659ccac8566
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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