Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad239208db69267…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 11:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5bfac86e71d95817b55c3850ed33d01 SHA-1: bbb55b8ea46a69c86a27d5e7f421fc107987462d SHA-256: 3ad239208db69267ff9f59cbd67d8525a3296cee8207feaa4c04cea062febba8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, with a primary suspicious URL pointing to `midufefew.ru`, which is likely used to distribute further malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple PDFs on disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=top+launcher+android+apk
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5febed6b4d606.pdf
    • http://poguzozod.sportsontheweb.net/literary_analysis_essay_tuesdays_with_morrie.pdf
    • http://lumogodasekepi.mypressonline.com/3283851013.pdf
    • http://kevifiregerufug.scienceontheweb.net/free_autocad_commercial_kitchen_blocks.pdf
    • https://static.s123-cdn-static.com/uploads/4454995/normal_60031cb3a1bf8.pdf
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5ff20e264347a.pdf
    • https://wevokowuluza.weebly.com/uploads/1/3/4/7/134739861/regunego_xogaropunadazo_jixavu.pdf
    • http://fukazab.mywebcommunity.org/3880972937.pdf
    • http://raguvigawak.mypressonline.com/to_kill_a_mockingbird_summary_chapter_1-3.pdf
    • http://wapividazofar.scienceontheweb.net/64594109335.pdf
    • http://kekijojovif.sportsontheweb.net/la_joie_bernanos.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60175fd7edcd3.pdf
    • http://fisujerekuvij.getenjoyment.net/cartello_vietato_fumare_2020.pdf
    • https://kezopepeza.weebly.com/uploads/1/3/4/3/134332650/8466259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce9b3a7d-caa6-42bd-9a5a-75ea0914cac3/how_to_make_a_patio_bench_out_of_pallets.pdf
    • https://uploads.strikinglycdn.com/files/5c3bdaf2-dc85-4cf3-a839-b7bf1773b93d/3483333868.pdf
    • https://uploads.strikinglycdn.com/files/5d742f60-c089-42c4-9a15-29681178bb87/94451069787.pdf
    • https://uploads.strikinglycdn.com/files/82f1caa6-8307-4ae8-af1f-d39625d58bc1/43333884126.pdf
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3e7acc28c8da45a58f9c620ce4de7bf4.pdf?index=true
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_233a3ac2a6504ffc981086ee100a6566.pdf?index=true
    • 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_off0000f23d.bin
e9b1eca6a7f06d76ef312baa7fbbf0f2aacd9369e111c3210da711a954f46825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 4996 bytes
font_01_sfnt_off00010330.bin
157bd0c85e8af8ca2dea30efdfcb6333f27757a48be191b03047455b16c3e448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10856 bytes

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