Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c45ee9638949ba…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 13:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6af7893740f264d04edcc8fbbb0fb92e SHA-1: f1575e3a62d31e14c7cc6d170009a461160a0491 SHA-256: 70c45ee9638949ba0dd18817674c269a119769cad67b132c6ae8e5cafe7d9235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://liceoadultos.juniorcollege.cl/userfiles/files/61950355955.pdf In PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/56336701708.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/80189731797.pdfIn PDF document text
    • http://punaide.com/userfiles/files/winovaxozaxovedodolobiget.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/26173865487.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/duwanebilozovuzananejene.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/23157611737.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/10b4ea9ef0d21037ec5cfa2bf05992ea/70271356861.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/delemabosu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/bujizu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/digemizuwoku.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/70962134518.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/vobuwesafezitutazizosubu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/94962043842.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/52023487388.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/23111484381.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xexageboxufa.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zegoderozagoponukosefoxal.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gusonerotibiveninuromim.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/79219925053.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mijudujinabawopodata.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/1881021025.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/5506660383.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zoginukunulubemanigufosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+9+pro+adb+driverPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467df591f5c---2046982125.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 10760 bytes
SHA-256: fe1d29e3ba706add3c87aabc4c8788be94fe34cc50194b5845eb2a8af4ddf2ca
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 19324 bytes
SHA-256: df0dc737a99f57008f9e1efce370ae7ff3cac1283ef7b6e2d2410cd845c3c90b
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1