Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5dcbee412c42f0…

MALICIOUS

PDF

90.2 KB Created: 2021-09-09 12:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e517e9623310774e078f38bac9af2c08 SHA-1: dd2ea9de394129355bbf3c3017a5395f12dafb6a SHA-256: dd5dcbee412c42f0b8ca6f02383eff2e2c47c16e304ed51f66b304dba3339697
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://nsk-nalogov.net/upload/files/nefeloloto.pdf In PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segukag.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/21938440403.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/60689518301.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/49261078339.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/493884321.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/98379401307.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f17af4c6---25970008197.pdfIn PDF document text
    • https://esvigo.com/upload/files/77991774872.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132da991d323---72086404790.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gurinawefofudivis.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/fovakiboburegoweti.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/ligawufuvipix.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/55344873324.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35736585352.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jexibiluk.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/99025430832.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/56356778875.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/72098755580.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/33256144724.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/98757081898.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902165607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=this+boy%27s+life+pdfPDF 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_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10380 bytes
SHA-256: 70d563860178d4d0a3589b56413a612651a3473e338cbd91ccbe7b3c4cb89527
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 18688 bytes
SHA-256: bd5c5bb7ac5b4ffd46c04614187774a9bbebd5e69c79087ad03409f30542df8e

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