Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77b7bb4bd797a03…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9d6945c59be6e068a80c4988ff9acfc SHA-1: c064da29f13f9d8d7f999f900b32fcf68547ada9 SHA-256: e77b7bb4bd797a037f2c18efecdc3510f7803693186b54daa571293c58838e80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. One heuristic specifically identifies it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://electriccityusa.com/images/fck_uploads/file/magafe.pdf In PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/gasibubenidivebi.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/73472425817.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/padewenojetibonixizu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gezigij.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/mepuzujidisovosujo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99ff927b8---kepudevadoniwazuwopisawo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/80601889111.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/xixepikisari.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/589213415.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/bafiwo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133252bb6be0---52442134628.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/vejobaxujowusupekura.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodazugosozorikawigabalu.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/rimefafejali.pdfIn PDF document text
    • https://cowik.pl/upload/xewetifogawolagugupafono.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/94936767561.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/99175815866.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/mimuwakakoz.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/81094184901.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/84864280426.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/renuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gangstar+vegas+apk+hackPDF 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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 10592 bytes
SHA-256: ef48d828956a6e3de3af0bf1c2748044b8ed4633ef280d299bb2471467b52ad2
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 17404 bytes
SHA-256: 5516f81ea16032bccdc628b31fc682639d6e163bbe3c78df128d4110ee5116cb

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