Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15de76564521310…

MALICIOUS

PDF

75.5 KB Created: 2021-04-13 21:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11bef4fcce28ac2426c9da3e81131929 SHA-1: d7fddc3a5267443a09bb47f41f12efeb900aeaeb SHA-256: f15de765645213109595f51c8cd426b90df26fdd4f0216a8c6c26760c174eba5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=aisin+09g+transmission+fluid+change PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426556/normal_600c0d9936a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fe0f9132f1b0.pdfIn PDF document text
    • http://gelipoxupiv.iblogger.org/konujuwuziriluzevem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5fe64b7c0a450.pdfIn PDF document text
    • http://minedabepafosu.iblogger.org/najugilukilitapora.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/ejjghlR/crossword_explorer_of_the_16th_century.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/jgCUjaM/kujavewisu.pdfIn PDF document text
    • http://lojisaka.22web.org/32241464775.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/asma_pdpi.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/axiology_definition.pdfIn PDF document text
    • http://metinozub.iblogger.org/semobape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/30804636106.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_261e4ddc988a4d63b6d01026e412c7b6.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_2f59f632e71a4b9f97a00251898fa818.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_d305df2ea326445f8a50636ae1ff4966.pdf?index=trueIn PDF document text
    • http://mexefesu.epizy.com/18552266580.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d8736bba176c486ea554a03f14fea7a7.pdf?index=trueIn PDF document text
    • http://tosijikis.onlinewebshop.net/neoplasia_prosttica.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_7090cf4dbe20482ea810db045c1be148.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_0cc1654506dc4bb8bfcded96c0985677.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_d7561e0732134f2688256d52cd2aa55d.pdf?index=trueIn 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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5724 bytes
SHA-256: 11b394965c167529b29b2f4c4a6c5ef7a0f00b637e544f71d7b31c881c91dd96
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 10628 bytes
SHA-256: a8f67383c461d0f8ce6b4f878ff3f542d2152697866059583f30b690fb51046d