Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabcb22d6aa4c5a0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 11:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a3b865683fc280062c4af71fa122e49 SHA-1: 3166f4fea45676b2f2506491b900c7f5ddcf8685 SHA-256: aabcb22d6aa4c5a0e4e0dc87d2fce2587d9bae98fb7d7586cf1bf91ec50f71e6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF is part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 5

  • 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
  • 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://air-ned.com/uploads/files/sarasifuvazekejajexafi.pdf In PDF document text
    • http://www.hgbehringer.de/img/files/files/sodudujisawifepirup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161416d6f95191---9855804068.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/kopafirisilazoxagu.pdfIn PDF document text
    • http://rurisnet.org/images/file/51509036618.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/61513225273.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/45659434804.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/vojojinijekoloxemufemevav.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/derigumagebefuxabo.pdfIn PDF document text
    • http://waypl.pl/upload/File/radevibarogesikajesefivoz.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/gokogopumonikede.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/ririzaxobekolota.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81510532123.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/wozidojitulawufewur.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53984271046.pdfIn PDF document text
    • http://dgkno.cn/upload/73367256857.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/kureridel.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95741115715.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/zaliwolusoxolazusa.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/70244050674.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/40457727573.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ce0jndhpeonvpp4e60ds0h4oh6/nibuxiresimuzotolipug.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/venetogojoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+app+introduction+screenPDF link annotation
    • 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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 17276 bytes
SHA-256: 84eb0b73b7a67c9b37865eeb0b432c9dd1bcef982f9f277789640711309e62a4
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 10540 bytes
SHA-256: 97c944398de444aea75f2be3f6c05c8ac358092992b7788338865726dcfb2326

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