Malicious PDF — malware analysis report

Static analysis result for SHA-256 817aa215aa7b7c38…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 17:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 684644bbc12181dd544db60b8d681906 SHA-1: 7686ff85dff07847b152630e871c002653d26273 SHA-256: 817aa215aa7b7c38dc1aabbe12149286f53ffd658e8b220c0cb280abdfd4424e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function appears to be directing users to external resources via a multitude of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/award?keyword=canasta+basica+mexico+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407062/normal_604d9041d3545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_5fd7d8d08d864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_604654a1308f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fd6fbcfb2155.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/7467365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5febb493aa833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fcaff782802f.pdfIn PDF document text
    • http://ritual-venki.online/asp.net_introduction_tutorialspoint56813.pdfIn PDF document text
    • https://zabosete.weebly.com/uploads/1/3/1/1/131164473/vejux_wojurij_delizirege.pdfIn PDF document text
    • http://freefire-gifts.com/43093682853wfi15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_604cd204660fa.pdfIn PDF document text
    • http://reduslimitalia.site/how_fast_is_kawasaki_h2rbjqrs.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/wuvizisujo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccd98eda0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_60506337defb5.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/6176336438.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/ec91924ad9f.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/kulopugubifuregubebe.pdfIn PDF document text
    • http://cmbclientes.com/google_earth_map_apk_downloadfkceu.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/molanaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sazasewugekupej.onlinewebshop.net/82795886840.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/ncert_genetics_download.pdfIn PDF document text
    • http://merijimiz.epizy.com/have_central_and_peripheral_processes.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/chapter_24_apush_review_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 5464 bytes
SHA-256: f47e128cab6934a6423c9a2a8b298782335e5bea01d635b0c4ff72656616a882
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 11264 bytes
SHA-256: edfae2a8018b3e3ac4369f6e4fc4e47393f6804d5fa8b94976b8513f3d5dd11f
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f