Malicious PDF — malware analysis report

Static analysis result for SHA-256 76150806ca9d5130…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 00:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96dd238fd291ef6082e42d27df51de4f SHA-1: db01c3024bf45800463d59b6b887c4bbbaee8672 SHA-256: 76150806ca9d513075afe26ed778f8047cb806b02f9cbca592a44ee1ac7aa91c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high concentration of them pointing to disposable domains, indicating a link farm for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mabuksusu2.com/contents/files/85744611064.pdf In PDF document text
    • https://wonkingchina.com/d/files/85361167690.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zumusejitiwiliwadi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/mupagiva.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0dc4cad3852e2e4535911c76ad1777a0/fefedixotodi.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/67818988338.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109151054392993.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3d3226bc778a35ba3fdf5c8d2b06f8a0/minupiliwinixi.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/pezetajejisuputo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/korujajewesibunidasora.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/rowoguvumupi.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/86839186242.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/26947614702.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210909074753.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/zuruxevezewa.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/gevakifevetovesiriben.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/mawidadu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/57368230162.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/56352355453.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jukipuzedubumoworetifejiw.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/81035765922.pdfIn PDF document text
    • http://www.andreapondika.cz/file/41239019658.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/padaserotetodesov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=drive+simulator+2020+hack+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 17272 bytes
SHA-256: 56afb3d0e3be6c0854cea6e9058d354091e1dc6b46aadc690ba75ffd3bb4c469
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 11036 bytes
SHA-256: 2f4f2dd7dbd993d11bac63837249486c517eb0d5b40c3fef61818e9bacaba1e3

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