Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ce9edc48bb2f6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 23:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ede18a2a5285d38dfa04e156d3450f88 SHA-1: 3d4fb9b98b9895de1a78d73158bc2a1c9a1d2661 SHA-256: a64ce9edc48bb2f65ec0b8ba714114a402aedb434e61b3c0208089f409d068ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm, and numerous unknown URLs were extracted, pointing towards a phishing or malware distribution scheme. Although no scripts were directly extracted, the nature of the PDF and the associated URLs strongly suggest it's used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/86111762789.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0afae30e---ruvin.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/10576040057.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jepatojisarexotupogukew.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/71400087720.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xajujojotegidorufumatafi.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zoxajazudovufowinusedavul.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/misitopuxafa.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xeminanozov.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/12572199552.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/86681596893.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bowerixuvumolil.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pozuroxowil.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xolowitetak.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/65381096942.pdfIn PDF document text
    • https://yasacompany.com/upload/files/kabezofiwisepepe.pdfIn PDF document text
    • https://htchninc.com/d/files/segivaxujivusetemonabo.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/rarufezamewera.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/kimopajazinutomidobobef.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wedeziwagiteloxolava.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tagaraximejewipamidazuji.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/2422938969.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/75271415615.pdfIn PDF document text
    • http://hla.vn/upload/files/neriduwinorefaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+improve+internet+speed+in+android+mobilePDF 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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 17216 bytes
SHA-256: 61dc849093f5c751797eef00f16c6c911538b0737284add3a9d1287b0fad50ae
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10836 bytes
SHA-256: 989541226822f618fed78b9a4cc0285878de22452cd7d87fb9dbeaa6c3e59f78

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