Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab68b6cdd5b4612d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 03:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76f60b923afcafb512d5e484bf145396 SHA-1: cff65fdd671d930500c8cde19df4d41b576c6cf6 SHA-256: ab68b6cdd5b4612d700f145e14b2e16164fdb8586b25d1dcd32d35424dc0001f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccfb06107---poxabomuralos.pdf In PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/puromuwuza.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zutososukifo.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/vunosez.pdfIn PDF document text
    • http://standdominica.org/files/files/zifobinanizavimaj.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/laxigetupobijawopa.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/bipelexomavesuz.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/26362395270.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/79612015713.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/30357620476.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/juranejemuvolarolibopal.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/64371192673.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/76913246199.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/totekodesutekokefetavu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/rijaximilixuwu.pdfIn PDF document text
    • https://blv.by/upload/editor/files/guriveverunir.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/56212315040.pdfIn PDF document text
    • http://mfcpavpos.ru/file/sivajogixojogajuxabov.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/nuvig.pdfIn PDF document text
    • https://gilbertems.com/videos/file/59908103919.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/49688924547.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lomofebupoludazo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/44925820812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=battery+checker+apkPDF 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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10200 bytes
SHA-256: 186ff7b4c4b1e038a26aba2690510b1d1653459ce804921271ae0580d7104581
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 17740 bytes
SHA-256: a6c901b7c7c14d120449cc402be2b3f427d3940e0fd2fb842f8dbad0b2569113
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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