Malicious PDF — malware analysis report

Static analysis result for SHA-256 9066d28e9036b815…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 09:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d553ea9ea21482cea23baae9f659ab60 SHA-1: 8781f173366f21da04dc84664ecf9dbd133c2731 SHA-256: 9066d28e9036b8154036ce945b5c974138571f3ad984d99a302495fcbb7a5ce2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable hosting, suggests it is designed to redirect users to phishing or malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link-farming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fast+racing+3d+game+download PDF link annotation
    • http://simonkuehner.de/gfx/userfiles/files/bisepagupifisabidekudab.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda4907151---75309923501.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xusepogif.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/bivukofuxadinatimivifu.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/vejubosixu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408bed831eb---nuxepa.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/84003877163.pdfIn PDF document text
    • http://qdjshg.com/files/file/desusubibifubixozil.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/78821523307.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/20622829016.pdfIn PDF document text
    • https://network-italia.it/file/8149358821.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/namexapagasajiregikove.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jejijenaxolovoturuje.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/butefeviduzifojawitus.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/zabalulotujaxexox.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/tulemure.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/41204793608.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/1030440039.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/90905560083.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/66344612660.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totaduzexav.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/wisexawovorebikizebamoka.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/fosigagezaboxex.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kevenotikifawipo.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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 10948 bytes
SHA-256: 7c6d8e413b43923c0300ec67a949c305bb8fb9c2c7a605c4ea8a7827c1ae7db9
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16692 bytes
SHA-256: 4eb0a40cce2ee091fb6849b6dc961acfc01cfa483429ae0a08869918706e53ad