Malicious PDF — malware analysis report

Static analysis result for SHA-256 9493f3a116204b4d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 10:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 846a19ba6cd794957b161c314b44b6d9 SHA-1: abe16f9261e351f98f73699b076f19e6237daea5 SHA-256: 9493f3a116204b4dc422622451b7b84deaa4614db2c0aca094120b7c87b95f51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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=how+to+get+root+privileges+on+android+without+rooting PDF link annotation
    • http://cistenivytahu.cz/upload/file/kafimasami.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/berodirure.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/84749663174.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/misakonodojotixojoxi.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/pukovepebikosu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/84061048900.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/79945093106.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/ripurojizudipajegol.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/6600542713.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/kefipejuzomilipoxowowu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/jipozoxoberipulupebawin.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/wimikisedudozijinokegow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2924ff2b---rinitidorelivebeboworixuv.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ninokagapogefuvewajazu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/towupubomed.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/sikigagososaseruri.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sodugojejitozopife.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vexadosoviledudif.pdfIn PDF document text
    • https://tl-systems.hu/files/files/rediwetol.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/21850056422.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/dotidudajurufo.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/xibumaxivegaka.pdfIn PDF document text
    • https://ever-progress.com/upload/files/20735523992.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/xurivuxago.pdfIn PDF document text
    • https://seikai.jp/free_images/files/73962725919.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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 14212 bytes
SHA-256: ea17f1536ec974c517c37cb3a1169b0ee861e0f565195c28c360a02ee474b2b9
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10912 bytes
SHA-256: 470f9ccc073f3eb749ab737eb480c57d5cdf700d9c1fdbc9966883cd632cc938