Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec25faee5a23101…

MALICIOUS

PDF

79.1 KB Created: 2021-03-06 06:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a3aae33ff7ea029ec1c396fb504f576 SHA-1: 5e08cca66d11a90492ced89cb8b1bf37ecc426e2 SHA-256: dec25faee5a231018cfba84e224d5e4355323e7239ee85953cd4fd721a35e53f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'jumiwimov.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded content indicate it is designed to appear as legitimate educational material to trick users into visiting the malicious 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/strik?utm_term=pronouns+worksheets+1st+grade+pdf PDF link annotation
    • http://dupamineni.medianewsonline.com/e_scooter_repair_shop_near_me.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/josomadozofobefasane.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/dcc5359a3.pdfIn PDF document text
    • https://gilanevevo.weebly.com/uploads/1/3/0/7/130739192/de65735.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/59016738006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_60011fec74120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5fe06e54ce84d.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/where_to_buy_kidde_smoke_and_carbon_monoxide_alarm_in_canada.pdfIn PDF document text
    • https://javeleguf.weebly.com/uploads/1/3/0/8/130873961/mejujixemi_bosudagajom.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/bijuwiz-retiwa-zagedasovu.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/39af8889.pdfIn PDF document text
    • https://nigukaxo.weebly.com/uploads/1/3/1/4/131453065/kofogigozu-kobujuxuwup.pdfIn PDF document text
    • https://dutagoloz.weebly.com/uploads/1/3/0/8/130814416/gugopovedivute.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/knife_sheath_making_patterns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5332b8a-ea3c-4dcf-96f5-3707f9065c8a/robeku.pdfIn PDF document text
    • http://mawokale.myartsonline.com/cambridge_igcse_chemistry_coursebook_third_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ec206a-d98c-481f-875c-cfbb5ec81b0b/96309851040.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/tukonajabivixaj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5480 bytes
SHA-256: 82682139bb429b4967d96fe39e5ccc4b0c61212c9f22a810e4b16c01048f5174
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 11472 bytes
SHA-256: 261ff39a1c9e5bba450412c444cfc6e02030ab190d65ec72c9a9611fa57cdb91

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