Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db697e59f850ed2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06c10b502de3afabd8fd5a39cc70d408 SHA-1: 5af4db20a62df3b59de06ced13d344d87b6237c5 SHA-256: 1db697e59f850ed2cddc83247d319d2bfd16ed55eea1a15984146e0309941a96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://manualismedicina.hu/fileok/file/40360378021.pdf In PDF document text
    • http://nanopena.cz/upload/file/16705442601.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/pipidosiwoferosigutiv.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/20a32f4f38933cb59e420787055afef6/rutirirevumokorevi.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/dididajamugiboxijukifakog.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/76138198536.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/jelagufenuvinuvepuvinebe.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/35068471122.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2743514741.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/29934117570.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/56745629225.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/fogibawabonunapivudove.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145663651ad5---98455185357.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/momedolidojalalogagu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tagorazibozuzolajep.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/28300384706.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://floramarble.com/uploads/wisavinebexesibudigepoj.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/mepuzojugokupanizepinebav.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/85059606147.pdfIn PDF document text
    • https://kokomanis.com/contents/files/94292398638.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/lapofakakizagebomewazoki.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/demozaseguvexuruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=asphalt+8+mod+apk+latestPDF 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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16600 bytes
SHA-256: 32b66f5ccb4ecba053e06e628a9e7258a5556521a759b9fdae2756befa9b5e9c
font_02_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10640 bytes
SHA-256: 4110c1da39a938e5894c4a5ce37bbad28ccfcacc5ace31c8ecbb761a71208f55