Malicious PDF — malware analysis report

Static analysis result for SHA-256 05291804c51ab80d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 16:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e48b1f6a4d2fa9939e97b4208d773338 SHA-1: 44b56c608eef6e4963647063a0aa83ed5031711e SHA-256: 05291804c51ab80dc5d18ec1136b632c8cd7c021755c0d6a696246f87f7c11ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious PDFs hosted on disposable domains, suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thestarbusan.com/FileData/ckfinder/files/20210917_1CC19D6D99330203.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/46032413262.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wemeve.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/58935685008.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/5220839081.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/36674924006.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/17195835992.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/18581397508.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/39436221135.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gubuwegajukitemidedu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/wikulurufuvavixarev.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/baxorunorixa.pdfIn PDF document text
    • http://rs-entp.com/upload/file/munowepomuki.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161382f0665c43---fililoke.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nixererofozuk.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/xanomonimadokexedew.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_08D2DA5E3B407E7D.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/99612928039.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5796f477d1cfe75802594366c84cb23c/48272077044.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/xudupaxevegusikedarunem.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/82437802251.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/65976350504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+myth+of+sisyphus+book+pdfPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17260 bytes
SHA-256: fbc6cc0c5aba2e6d2935e34d8f87e83f68c66082a8120e246fbb8440c7806da0
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10760 bytes
SHA-256: ff607d24f90859de83ed81739f0888acd7f6bb895052056fd3bee8f30a87bc61

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