Malicious PDF — malware analysis report

Static analysis result for SHA-256 6125c8c147668f7f…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 02:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6b383855d072576bcb9760c9e198ba0 SHA-1: 6a156082ae8dc2975cccc66e9f9cbf20ef140562 SHA-256: 6125c8c147668f7f23dfec81a2829fd2121db1c636a30c8b68f3969d765b20c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on disposable domains. The primary function seems to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=connect+android+to+ps4+controller PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/14355817075.pdfIn PDF document text
    • https://tmtteks.com/files/20153320093.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/bokekonijisewerek.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c26d53423---detisaketaro.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/39307620335.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nawikinovujekiduteb.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/87085077054.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f64a961145bcce74034791ac6bae383/kazulusafi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/67467761975.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/40544849177.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/1678126340.pdfIn PDF document text
    • http://safetruck.gr/images/file/woxokemorijomez.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/rugipaliwuluxofapir.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/50025374680.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/sebavi.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/75728617585.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nebewamedapixuguranejef.pdfIn PDF document text
    • https://etadelloro.it/images/file/63277970545.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/notalatajutipowuxata.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/36786000539.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88375954051.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/10175176844.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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 14588 bytes
SHA-256: be28e8206cce5cdefb9b8c68c6da764ff9c9ffb89cb04852ad9612830d8d6776
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10616 bytes
SHA-256: 10113b7d2c3e0f2565ca5a013d51a27a7e92867dc2e9ee7429e7f37955753e93

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