Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f377f78dd308a2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 07:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae66cc19df870c20b4407924bd9ce881 SHA-1: f37cf9cc693f824a8c8b42f7eba5caa606c8435f SHA-256: 65f377f78dd308a29f72fcbdafa02fa7bc37000485d46c2f67d3ac919e837e94
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=how+do+i+send+group+text+messages+on+android PDF link annotation
    • https://fond.ru/userfiles/file/26304969229.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2c0a16953cd00a90a947e82f279ed0f4/pavex.pdfIn PDF document text
    • https://sealskinz.ru/files/file/64379591230.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/bujakakojodite.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/71015691585.pdfIn PDF document text
    • http://calisnt.com/uploads/files/70541905894.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/lifotesopudas.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136b923abf2f---40219048311.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/79053437635.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sumapixaxovidufevajonekup.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/tiwiwasotasajogiseku.pdfIn PDF document text
    • http://client.diffuse.info/files/21758466083.pdfIn PDF document text
    • https://la-klamm.org/Files/files/jalitum.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/91998679802.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/1141517838.pdfIn PDF document text
    • http://salespate.com/userfiles/file/57795741547.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/44492376569.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vevizulumepuve.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/rasokokumaxi.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/84283132823.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/fizivitovi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/47594844465.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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 10968 bytes
SHA-256: 27d99bc1cc5cc0939aa7ea3dbd184c672b7bc429824c5dcc6a4f3baa1df5bc2b
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 18584 bytes
SHA-256: 6d6ebddf1a04d66f7bf6c80ed2406ff69df275b5f62462f718faa563ce0f3f3c
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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