Malicious PDF — malware analysis report

Static analysis result for SHA-256 1084a92f251480e6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 08:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1220e20dfd61526682c36b2cc0c9e47d SHA-1: d764fe36963210f3fda167bd3db630d2ec7010ca SHA-256: 1084a92f251480e62b09a0857336fdb6f4e8710d98b62d628d40b641f5705334
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The primary malicious URL identified is 'https://dugedepap.ru/123?utm_term=color+call+app++apk', which is likely used to redirect users to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/123?utm_term=color+call+app++apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604b4532b855f.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/bebuzoxum.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/gitesaziwogukid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6047c020d2469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_604631a22290f.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/chennai_corporation_birth_certificate_application_form.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/autoclave_principle_and_applications.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6028eb759c48a.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/77233417261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fdd626b814d1.pdfIn PDF document text
    • http://sugebowupubixo.mypressonline.com/basic_book_of_economics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajamozaxekega.atwebpages.com/auditory_verbal_therapy_techniques.pdfIn PDF document text
    • http://legevusibenasik.rf.gd/asma_2017_pediatria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bae50e9-e7d1-40bc-b4d2-c2ad0586fad3/how_to_fix_e2_error_in_sharp_washing_machine.pdfIn PDF document text
    • http://wupepiwora.rf.gd/67941278221.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_50cf07f770374730a8167e1e7dbd974b.pdf?index=trueIn PDF document text
    • http://lidorozina.rf.gd/types_of_active_learning_strategies.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_109416db40a24c53a3b796859fd178b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b81fc4-fe55-49be-8241-efa2c135416c/9205263173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920ed8aa-e864-483f-8461-f6a85b6d6e4b/37636263166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f891644-2a46-427e-8767-ca7dfe5db0d4/78818892133.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/28058760876.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_dc10546ea9bb41118146e77753c6278c.pdf?index=trueIn PDF document text
    • http://vitewunidamol.epizy.com/56587567103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4dea15-633d-4994-b401-ebb121b487fc/personal_training_fitness_business_plan_sample.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 4716 bytes
SHA-256: 9a88146933eb0908f94b9ca8f3588e45923556b76c4486b81b33dbfbf3573ab7
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10716 bytes
SHA-256: 5b8f991d7184f3baa7fe25d75bac38b25de57de39bea5d1d6a4d0fd89b41fa18