Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf982fee7d2a6aa9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 16:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a812e55781c2fee94ea9f62b12d5622 SHA-1: 9102597b6fb2d640a46a065afd449104b59939a6 SHA-256: bf982fee7d2a6aa9b226757229b65da4652527c35dea7633b93336d9e81cdc08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links, suggesting an attempt to distribute or redirect to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://daiichibus.vn/uploads/news_file/wumukikigab.pdf In PDF document text
    • http://kartelabasligi.com/images_upload/files/43702598794.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14608266874.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/56669906912.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/gelirubitinaju.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/mititazajexatesapisa.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/36397018840.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/48194560413.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/44459336469.pdfIn PDF document text
    • http://ned.ru/uploads/files/16675210318.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vemiriwusulupoteru.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffa2d0810---ruxegokudunetimow.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/tebogodisofebujiwe.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/58437055434.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/25396450197.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/69320541136.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/wobilovisevevipojizojite.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/22972650296.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/98713972317.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/tijuxasamodosewux.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/derozanibitebisapexo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/58195406730.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/ganerezugumaxaninusetoxa.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/xunifizenefufawowijek.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/ragorafekerapasuri.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxegitugulivexisa.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/kanuxexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=broken+phone+screen+to+pcPDF link annotation
    • 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_off0000b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 10316 bytes
SHA-256: 9266d06c667fc89b2424679f21cdc54c99e0837da60b32fc3eb3569afb8912bf
font_02_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 17044 bytes
SHA-256: 708b75af4186f2d676a025e358899e8a56ce62392dd6a142b66fdd43620c939b