Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc888eac163e70b6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 14:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 899ed08ad3e6bbb8db415be809d7a03a SHA-1: 4c94143509eb25f75db6ec84bfcc684ea2149d39 SHA-256: dc888eac163e70b6ddeb5ed1bcca4aced06fac46c135e60f4fde78b1a3a77622
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to redirect users to a network of links, likely for malicious SEO or to host further payloads. The embedded JavaScript is likely used to facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bakineshr.az/ckfinder/userfiles/files/lawesakinis.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88003577574.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/26680256291.pdf
    • https://proxus.nl/file/telorubikij.pdf
    • http://bkm-market.net/userfiles/file/nuzorulosojofedulifu.pdf
    • https://ubranni.com/uploader/files/80419759914.pdf
    • https://living-stone.lu/userfiles/files/romirudakotutinezito.pdf
    • http://grupposcorcia.it/userfiles/files/18699764684.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135226e663ef---22568143140.pdf
    • http://artvideo74.ru/upfiles/files/wokelikemezetoruvut.pdf
    • http://problemconsulting.com/img/download/files/73630631441.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/xibapajumo.pdf
    • http://misosmile.com/upload/editor/files/lovunumijawexam.pdf
    • https://samngaimarble.com/html_upload/file/nojigobidezetezoni.pdf
    • http://ana-jsc.com/upload/files/31974553411.pdf
    • http://hyunsin.net/userfiles/file/katukovuwaba.pdf
    • http://gammatradings.com/userfiles/file/popifupekugirifu.pdf
    • http://puginternational.com/ckfinder/userfiles/files/wilir.pdf
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/duvofanejapotur.pdf
    • http://opusincertum.it/userfiles/files/71032079688.pdf
    • http://rabotatver.ru/userfiles/admin/zisujupi.pdf
    • http://clear-es.net/yamituki-n/uploads/files/94884330903.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cdd63a5ef9cf64efe15b0cae167cbaf3/lefarisavulebijamo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=casio+fx-570ms+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d443.bin
59b632c38242e6493b7a9b597d8dfdf63d20931d07b0677b4672e832bcbdb806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 18372 bytes
font_01_sfnt_off000103b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
font_02_sfnt_off00011bcb.bin
05831459e97d0a673070ef9aa2a523a6991120690020d8f25a9f7524029efadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10616 bytes

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