Malicious PDF — malware analysis report

Static analysis result for SHA-256 766c7c674ea38317…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 01:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47331e7b44debf6a591eab94f185aee1 SHA-1: 741cde24f7f6facec2a4a40bd57520e3af1bdd09 SHA-256: 766c7c674ea3831752046d36d2eaf3c4f9342b96e51618432e7212e58940a24f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting, and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many of which are linked to file downloads, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=lords+mobile+android PDF link annotation
    • http://bxbrdh.marketsearching.com/upload/files/ruvafos.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_A9B04B865609095A.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/62575346207.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/lopotewa.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/55882351419.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/podekodefulotuj.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/gixojibupubumopexiwe.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/gitifosunujafavanutifab.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/duvexove.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/29171572167.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090323321727660.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ratowadolebog.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/76183685768.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/mifitituzopasika.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/88146001962.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12420022785.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/99308778924.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109191212127040.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/xebejava.pdfIn PDF document text
    • http://gr-chem.com/upload/files/63214170580.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/15823288302.pdfIn PDF document text
    • http://co-mit.com/uploads/files/89821979418.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/pujenixero.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a53e44c---rolegol.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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 10408 bytes
SHA-256: c450abaeeb988b59acd21ffd7244bc543b44663750f62cdc31266124db6af6b2
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 20656 bytes
SHA-256: 88210c06be2cef453fb5d4cc320844650832346f479f0f3cab9ca0910f6b58bc

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