Malicious PDF — malware analysis report

Static analysis result for SHA-256 e503b878807f93ac…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 15:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f03a17ba216c3e6fb4c98f62676e9895 SHA-1: 29d262a8dc88092b79d632fdfd040a1275ea9323 SHA-256: e503b878807f93ac74fd276871f0f55584ae5b0bb03f737061d3d8c2bb34aebc
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various platforms, including disposable hosting services. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the document's structure to obscure the true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=system+analysis+and+design+exam+questions+and+answers+pdf PDF link annotation
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/fawoneso.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/rilisina_pibipivo.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/15da591c.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/sasawu_jelurafutun_bumaxuvel.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/a08d9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_800c9da316414cc39eb4d9c6ed3592f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89247ff-57f1-4c2e-aaf1-80f152ed2abd/claas_510_tractor_for_sale.pdfIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_e5d6b5fd925844e2bf51a226bd7f3bb7.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_3b251a914bfb4d5c90569f1370d24e15.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_ffeb10109f884af787a66bcd39038c31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a638ab7-224d-4ba1-81a5-20de26c5cf24/what_do_you_need_to_get_your_drivers_license_renewed_in_arkansas.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_674b741b35774f2eb9674160e3eb4858.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_1bf4ec9a288f456d919bc51a8599cec9.pdf?index=trueIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_69be3e89b290486dab385f1878346356.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_929fb1b7bacc455990025ee5fc43741d.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_46b299fba8da424196bebd408d2e9167.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_9be74bc51826453dbba5b2847a88784e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dddf9a-5407-48b5-a766-279a9e486e8a/what_is_the_wiat_iii_and_what_does_it_measure.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_5d98fb61e2a8458a99e68b0df7e12b09.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_210c457b8faf42cd988cd05eda48bbe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/467160cc-dfd5-4863-b974-8e776db0096a/vazotedavubakegovor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0fe5a9-a448-4feb-9329-72a715b55252/world_history_quiz_questions_and_answers.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_f6ff9551f804446fb5643619204b2ab1.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_17520b40422c40ef8c3521ddb1b55d72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84158f1-4945-4049-8503-8ccb0adb7d75/66286245415.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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 5852 bytes
SHA-256: 0e9d3cf753da01c7611e41ee8976fc45f43c201ac18829d575b70c24f715b998
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10516 bytes
SHA-256: 8dc0989f917c7476dc5fd9adf6e7fe8470aec4a8397fa14c61d5cb81ade5067e

Open this report in the interactive analyzer, or submit your own file for analysis.