Malicious PDF — malware analysis report

Static analysis result for SHA-256 43635782bac81e78…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 05:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd46a7f72858838ce37cf044cd0554d6 SHA-1: 958776b99835ea77a3cc2978a136991a65626612 SHA-256: 43635782bac81e782785d8edd4feebbcae3366852f0c06a69d0c29f6616d6094
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'jumiwimov.ru', which is likely a phishing or malware distribution domain. The PDF structure and embedded content suggest it's designed to trick users into visiting this external link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bob+marley+dreads+evolution
    • https://cdn.sqhk.co/zodavujera/rifhcG3/kosimukezotemivaduwawa.pdf
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ffd1ff4ba2ff.pdf
    • http://fomaxos.22web.org/what_kind_of_oil_goes_in_a_honda_pressure_washer_pump.pdf
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5ff1703ba2afa.pdf
    • http://nuredalad.iblogger.org/biogeography_download.pdf
    • https://nibuzexo.weebly.com/uploads/1/3/4/7/134720699/jusetin.pdf
    • http://pozonewexoz.iblogger.org/39222561912.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603b2b0146ccc.pdf
    • https://cdn.sqhk.co/jogeguzotire/2ggvjfH/30217401098.pdf
    • https://cdn.sqhk.co/xapewiwud/hktQaia/malagemujabi.pdf
    • https://porepegozid.weebly.com/uploads/1/3/6/0/136050151/nanagaker.pdf
    • https://cdn.sqhk.co/niwuwusogoxo/gexhcgc/22745267640.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/veledabejufi/dell_optiplex_3010_i5_3rd_gen.pdf
    • https://uploads.strikinglycdn.com/files/1ef50b83-e664-458e-be34-ed46cb72adbe/no_game_no_life_ending_explained.pdf
    • https://s3.amazonaws.com/xalasawu/40k_gathering_storm_3.pdf
    • https://uploads.strikinglycdn.com/files/2595c411-3f71-4d1f-977f-e7b76c502790/dutafomivejagitiwinokima.pdf
    • https://uploads.strikinglycdn.com/files/17b8ae78-c685-46ac-96d6-9e05f4515caf/foximodi.pdf
    • https://s3.amazonaws.com/gewuwasi/79733859730.pdf
    • http://wirukuboriw.epizy.com/top_5_data_analysis_software.pdf
    • https://s3.amazonaws.com/gisujubolidine/77473199303.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edef.bin
564f750e6b41f93b3d05c6e5a5a1f8a25a50cd9ba3f8bff2077af4605cadc766		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 5204 bytes
font_01_sfnt_off0000ff81.bin
c3f0d587f8a132febb38085181f08a277b5842b6d8369ce8225a7e06ef78016e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 10820 bytes
font_02_sfnt_off00012476.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 4324 bytes

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