Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2c4915b7b0f42b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-03 23:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e80fe8f5db4bf9977f50cc46b91d59c8 SHA-1: c9e8d4ff6c22a8258a59e1d89792035b9e56700c SHA-256: 2a2c4915b7b0f42b649c4354afd1921f95672faa0aef331b51668eccdf47ecd2
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('resalured.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed for SEO manipulation, likely to distribute malware or phish users. No scripts were extracted, but the presence of many external links indicates a strong intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://resalured.ru/award?keyword=bsc+physical+science+computer+science+syllabus+du+pdf PDF link annotation
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/monavokedono.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/wowiro.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/libro_de_blancanieves_en_ingles.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/1347258793.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/3081469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fc9cd8bad230.pdfIn PDF document text
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/sevelejulu.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/allahabad_high_court_aro_2020_question_paper.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/how_to_increase_the_anointing_of_the_holy_spirit.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/31263077887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_600941d2cdcb0.pdfIn PDF document text
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/nisixiwono_moxiworevatiba.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/c2a57243-d777-47c4-b12d-d9f5f3d3f995/love_poems_in_spanish_with_english_translation.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/72254749266.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/43527883215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1adc29e-a5e6-41b4-bd5b-a9653e077f0f/disk_operating_system_software_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0dfb7f-9477-4862-a3d2-7f8c7dbbd449/bupukifamuxege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6fa093-4a6d-45fb-b0af-7322f53d6fec/xufiruronetivud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4dadcb-4db5-42b8-9839-860ea68316c0/volume_of_sphere_cone_pyramid_worksheet.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/how_to_add_teeth_to_partial_denture.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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 5688 bytes
SHA-256: 7d77292a934fc00207d14e8565dbfd46d3be682b47b0ea5c94796ac9447cdf38
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10928 bytes
SHA-256: 8345c914c33f8489a9252196a4e94824d155d76b0f89e06ee033eb32d97120ab

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