Malicious PDF — malware analysis report

Static analysis result for SHA-256 3695432cb1a10548…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41fc9960c36742375e50ecf6664ac113 SHA-1: 44862dd9451d60eb2f2671af50ecd636e5c1da38 SHA-256: 3695432cb1a105483ed5400722e42952cb13ff84639db6ac460d5d60525dc871
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=network+layer+services+in+computer+networks PDF link annotation
    • http://www.euro-fly.eu/userfiles/files/133476254.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/12899723723.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/78131267826.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38271631808.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/vuwogugowok.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/88619713377.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/93087265841.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/pigiruboxomagimow.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/34417694603.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/pajagexujopemewawivukoj.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/zojijimirevimurebetuvuz.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3927476229.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/17094774538.pdfIn PDF document text
    • http://klinok-saintp.ru/files/5967059767.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/gokajujogolawola.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/gipoleligem.pdfIn PDF document text
    • https://blogsma.com/files/88740371792.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tovekora.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303526087f4---fagusofufabelu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zomizitawutaxesanozive.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/99057227622.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/tolenibinudi.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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 10972 bytes
SHA-256: b8969c3560b4397d3df16604a03275dcabab7e64d7283ec7721a23c7a6b9a8b0
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16420 bytes
SHA-256: 660d2f04f005e2105148451ec1c6f54283ae04c0539bc5f06b00a7d110a884a3
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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