Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6fbb05167775e7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 09:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c5b02e4c25a2ec47b9181ac11443b081 SHA-1: 97bb00fca25fe92758366bd33f16527df628a4ba SHA-256: 8c6fbb05167775e79e5003c3e8df083cb9a0188017723604672521377be857fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cleanking.net/userData/board/file/51336187696.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vakutimaxotu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c2hfd2k6ne6tcok4j1plfu1ha0/60400037457.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/39296017125.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/66881832978.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/guxuwizepetezibevu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/17707850498.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/53651904176.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/dosexamodezejevinijisi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/sabifelupikavufawi.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/pajopapimigemo.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/53718461049.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/xuvapugiwupavo.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/39803149522.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/runivawuvefogasevorazit.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/59304791489.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/63024265106.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/gebixokuweke.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kedofumipuxilizepab.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903235024.pdfIn PDF document text
    • http://finchamauto.com/pics/10932622294.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/68402820757.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/govut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+keywords+for+websitePDF 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_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 10520 bytes
SHA-256: eefb653b29e08efda1afc34a9c4906f4961c2da8230e6ea56d44325efd7eabfa
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17760 bytes
SHA-256: 7cde665fe36044ab6c3242458516ea4531b192e2e449954071b74a95e4ab232c
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1