Malicious PDF — malware analysis report

Static analysis result for SHA-256 b209787ea2bc3415…

MALICIOUS

PDF

75.1 KB Created: 2021-05-09 02:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efda9e69d8c7e773e1c7e7d0a95f83d6 SHA-1: d7e4efedfeef4b4a7a3aca3756100cc975f1b785 SHA-256: b209787ea2bc3415481dbfbd7005a23343f1e796b972308fe485361d6e0dad66
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, with a significant portion pointing to disposable hosting and employing UTM parameters, suggesting a phishing or spam campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that the document's primary purpose is to redirect users to malicious sites, likely for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+does+temperature+affect+particle+motion
    • http://tublitalia.space/86121332044620dr.pdf
    • http://reactivaperu-viabcpi.com/dell_inspiron_620_intel_hd_graphics_drivernbiof.pdf
    • http://nokasosozigof.mypressonline.com/bewupamulomesodagowimip.pdf
    • http://afracheat2.xyz/delosorozalakebeyvxu7.pdf
    • http://siwupojotuj.getenjoyment.net/17720606546.pdf
    • https://cdn.sqhk.co/xidupesijij/i47jaGE/kiduvevutifimebofed.pdf
    • https://cdn.sqhk.co/nonuripot/nPghpm5/fast_racing_car_games_online_free.pdf
    • http://munasimowijuxi.getenjoyment.net/lewevanijewaket.pdf
    • http://mapotilij.mygamesonline.org/55583766848.pdf
    • http://creditscoretracking.info/fipitejopenanifinbw28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_cb4f5e8321a74f1fb0f3bd8a082d2c07.pdf?index=true
    • http://rizokimom.epizy.com/21333599012.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_a4d6ab8c0e1341dca1f86d76daee24d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/859360cd-3e97-4d34-8bb9-38264452fe99/vosumonumalifenutulo.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_2d60061c1ace4d948c0895bdd1d31339.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c3e4ed4-b11a-4a5f-8c05-db8f75bcd3c8/kenmore_elite_washer_repairman.pdf
    • https://b5f62e6e-b620-4b0e-90dd-fa81fc7fb5c2.filesusr.com/ugd/18d815_b2529701e07d4962affe2a05cddb708b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2cac2eab-5aa6-4dbe-a6fb-41959ddf41c9/dd_spells_by_level.pdf
    • http://xosofidevutora.epizy.com/bollywood_movies_new_2019_free.pdf
    • https://uploads.strikinglycdn.com/files/a107a0d9-b56e-4bd7-b2b2-d9e35fabd735/zarubikujumelup.pdf
    • http://keloxodo.epizy.com/hamilton_beach_flexbrew_coffee_maker_not_pumping_water.pdf
    • https://uploads.strikinglycdn.com/files/06bd7988-a4bb-4003-89f7-2fed63aaf24a/34021477566.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_off0000e6cc.bin
81cb69abd5b32f4f6467fd95eda6980f671c739e4a4890db332c25dec11ed37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 5356 bytes
font_01_sfnt_off0000f8f8.bin
fee1db1e093aef7251859008119078f3424749b3f4000c1e31350d3edd7484f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 11028 bytes

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