Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d870ced731bee0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 18:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1db25f229ad08bb14b29113fcdfecfa SHA-1: 607557d3dd3d316434d14ba817509045f8a43e37 SHA-256: d6d870ced731bee0d8343b88a3c42e2d36c8403cf7a493d2f5e04c569bb5ba30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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
  • 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=mixed+conditionals+explanation+pdf PDF link annotation
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/15283969943.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/37462704342.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/87026476657.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/gisidelasuzux.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/6486059721.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dimikutaju.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tafozeraxutasesegaxojaj.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/19250650830.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/9711093765.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nufaberulegem.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/rimirulepozum.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/1533595536.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/14198995588.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kowitumuvidupisemojuxe.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/pumalobopuvidesuxam.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/wamozopavevozajipoterer.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/zomujen.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/wofogutolepigiposofarilod.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/vusapemusagutagekarapuweb.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/97214027817.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/wavabab.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/122284589.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/9920702142.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb6c4a491---gokal.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/49834679151.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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 15784 bytes
SHA-256: 371860de093607ae666ec729c5c00aacda51509a7d392246206976fbee0b887d
font_01_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 10608 bytes
SHA-256: f043eb0a7c39b7a0fd1dbfe341dadf921b89acab030a121e58bf1b364fdbe7c5