Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f96899f4bc8b763…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 15:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5233c0b5d7b239c073f66a9fb6ddffd1 SHA-1: bb72be64ead24585388428d6038e4e9de003fb51 SHA-256: 0f96899f4bc8b76343b859bdfe6271c149054aae81adf965c1639586458f8a84
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'jumiwimov.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms, a common tactic in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=mario+fire+flower+8+bit
    • http://fifuxuzod.iblogger.org/10485361334.pdf
    • https://cdn-cms.f-static.net/uploads/4459162/normal_604b79c6c97a6.pdf
    • http://sununetapa.22web.org/zutizemozom.pdf
    • http://suberubepuparo.getenjoyment.net/gesamugodetuworesipuwuga.pdf
    • https://static.s123-cdn-static.com/uploads/4413977/normal_6007a7f2ddfa3.pdf
    • http://pasipodo.mypressonline.com/understanding_pathophysiology_5th_edition_free_download.pdf
    • http://mapimiz.22web.org/59774074518.pdf
    • http://puvepum.getenjoyment.net/behaviour_management_strategies_primary_school.pdf
    • http://bajifepeselok.sportsontheweb.net/ritol.pdf
    • http://jisijopimif.66ghz.com/excel_sheet_macros_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://forawoxo.epizy.com/guzusevixidavez.pdf
    • http://tiguvazigavis.epizy.com/ares_facts_key_information.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_335c90258e1b4bf3bc193d0540597dc2.pdf?index=true
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_182a6cfa7c3b4a1bb674220c59120cae.pdf?index=true
    • http://dinedolorexos.rf.gd/tony_robbins_unlimited_power_free.pdf
    • http://noroved.myartsonline.com/4312962381.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_a9403c048ffa4a68b197c05bf91920ec.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_6d5ee9aa51ee47dd9f4c33fb5ef63c73.pdf?index=true
    • http://bumurulepowele.myartsonline.com/bringing_in_the_sheaves_chords.pdf
    • http://lisunamubeso.epizy.com/gisixopa.pdf
    • http://wonanikapudidak.atwebpages.com/ziruwunuwagafufufupatig.pdf
    • 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_off0000f164.bin
af98e7bff0ed4accb8d20baac1f75583d3c252aa67e5aae39995bcffd01586bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 5012 bytes
font_01_sfnt_off000102a3.bin
ccc382103fb6689327c98f3b5770045366b2814681ec1e5893a61038a5c1a113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 11312 bytes

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