Malicious PDF — malware analysis report

Static analysis result for SHA-256 291e9b9cac6ceb90…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 12:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46113b87e070069f2550b1897c3ecbeb SHA-1: 783c4740380b67b929eae2431acc89c737b7a060 SHA-256: 291e9b9cac6ceb9027a6cd32c1f63a99212ae9187fc8728bf882705a60b96cb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to trick users into downloading further malicious content, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=download+wallpaper+graffiti+hd+for+android PDF link annotation
    • http://youandisagenix.com/ckfinder/userfiles/files/pemalajeze.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/laloji.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/45601153766.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/71995744507.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/18547739219.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/jabadubowuxiregetewuxoko.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/79910895839.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/80987372301.pdfIn PDF document text
    • http://koala-al.com/d/files/dadabatokararifagebawiw.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/towoparusuvigev.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/99670016993.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/83823254443.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tojoxokubagitofokigivofin.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/55974987999.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/56382101837.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rabaradopu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/dusevisajobulirip.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/88820007650.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/fewofijagakasik.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/fupedorafenotelumavu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tmf2hhk0amnhj5efso9cutigv/kubobepi.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210916121655.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/tazesidowud.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/febivabikerelaxigi.pdfIn PDF document text
    • https://eklyps.net/images/file/25971855396.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 19500 bytes
SHA-256: be88a2272f8d09adba2ae05e535fe2c94ac887aab7809cb41a317e5b56ef1004
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 10696 bytes
SHA-256: 30950b5ef73476e17025119db465a10f5dbf5dee879b49849676bdc8b16a492b