Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2c29de7f69729b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 22:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d48f93758f64c3e05c271520a6462e9e SHA-1: c3ac97bad0d8ebc5e2434c168052b7439c49f3e4 SHA-256: aa2c29de7f69729b0cae33fc66bb53c63796d0be8c3587b7946f2639d5f09a3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://medvor.ru/uplcv?utm_term=meme+songs+roblox+id PDF link annotation
    • http://sromedical.com/file_media/file_image/file/risowododisolu.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/80942083702.pdfIn PDF document text
    • https://kiptep.ru/file/wujimofewoko.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/42373504869.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/bogif.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/49119356943.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/jizawikepavezivenuzefopax.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e6d5ceada4e4ed1c52b73d2e766dd01/30399168007.pdfIn PDF document text
    • http://vietlinktour.com/userfiles/file/37184964525.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nuvexoguku.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/vasiwufobopomi.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21965429044.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/netedutid.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zaxigatojurawabapazuwu.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109140751032328.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/tesanorosugaxubo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/27167a8ba6670d79542b48fffa56bb8c/52459107664.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/651020070.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021924216571206.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/batukabegiluximukeva.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/gevabosafoxe.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/gevupavob.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210923064718.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://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_off0000afb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 16260 bytes
SHA-256: 7d69b899c0d4c33ed5058a0992d161dd7e4211014eea72363863e95e5f2cf587
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10564 bytes
SHA-256: 6bc1bcc477962169721e707538a7d82db4734c9be20ee2e9aca6dbce2639359e

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