Malicious PDF — malware analysis report

Static analysis result for SHA-256 3678a81e1a142085…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 14:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7829900aa73ebbf49b9e3b5213d9f784 SHA-1: 0289fc77b1babbda255e9fb283006273f2bae27e SHA-256: 3678a81e1a142085abee53801574b120594910acc15bd33f0dc317b9e2605cd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting, and one specifically identified as a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://pistant.ru/uplcv?utm_term=show+system+apps+android PDF link annotation
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/34608495337.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/vafotobitopusojute.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/58624492267.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wajil.pdfIn PDF document text
    • http://dobermanncz.eu/files/budawofavegema.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/16806844844.pdfIn PDF document text
    • https://alariel.be/userfiles/file/78030883322.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73624328672.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/12288230925.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/83642041125.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuderobabigoxusak.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/vurofaruvuzinevotekefet.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/99129984428.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/nuwipapo.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/59257176530.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/jururivobuwapivuzonawetu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377098d1ef9---10858280196.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/rakukap.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/sebogifujesuxagukelovenab.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/92374889181.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/govazenexasuturupizo.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/63692328660.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/792494928.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/71385580046.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 18424 bytes
SHA-256: 6debf4952687a51ab2a8cbc2991571b33577fe636153beb04188701a6dd2adea
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10884 bytes
SHA-256: 778f0bf75cddc6fc522d032485b1b10adf99f5a073bc67bf7c125cf996b117da

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