Malicious PDF — malware analysis report

Static analysis result for SHA-256 108e5eb4ef7e443c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 04:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3107df4309ab8469123fd8a446d5d67a SHA-1: df47db72e8e64695a4e331cf327c31612a8f2653 SHA-256: 108e5eb4ef7e443c36987781a2f06ca421ee724c5666c7847b1deef9009d4f8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a phishing or link-farming attack. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://maketmaster.ru/admin/ckfinder/userfiles/files/49345812864.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_4BE9D39ABAA33AE7.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/vepane.pdfIn PDF document text
    • http://indemo.pl/Image/files/natujutelamebanesipuzif.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/7732419620.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sifalenetiwek.pdfIn PDF document text
    • https://blugarden.eu/file/57329526244.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/49028589306.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/37562822910.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/zeniminesatamorigije.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/19593589031.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/funavexefegabirop.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/40173339020.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47530479fb08628026fed87866699427/bimurofedarefenonam.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/memebino.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/gumigewufifovoxosifaj.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pebuvamavobagakilutakat.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/kibinalorupegedokegula.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/65461063019.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/dudorukepiv.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/26346540270.pdfIn PDF document text
    • https://diphong.com/uploads/wuwebepewopudunoluzuxukub.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/ruzelukisegilef.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///69703003131.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/79266122186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=venom+full+movie+part+2PDF 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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 16568 bytes
SHA-256: 1d3684502e19fdb3b5d1d57cff86f3fdf83536c68c4d3146b266a65495559405
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10604 bytes
SHA-256: 4e9bf86c67b692693a76f1ff34451698ae06d92b0971b19802d86930f8d9a941