Malicious PDF — malware analysis report

Static analysis result for SHA-256 2138652efc2345f6…

MALICIOUS

PDF

96.8 KB Created: 2021-09-21 04:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10fd8d697f95db30bd19c7ef9c93a869 SHA-1: 5407972fdd5db307dfd7f1a6ee340ccd2e08256c SHA-256: 2138652efc2345f6cea25592b0b3ad5335ad4d78cf6ac408fe0152baf29aa25e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=gta+san+mod+android PDF link annotation
    • http://jeanthompson.nl/ckfinder/userfiles/files/72461557473.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-20/4d78050ba1b732dfb1bc8e9b5302a54f.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/57454397992.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/fafiza.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/79112529808.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/83097175789.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/7499322988.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/75868933046.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/movagidapebitiro.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/27723552035.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/98025075185.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d12652a31---72495289292.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0d4f81c9d---josopejapep.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/81983133875.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/69334171359.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/28004005323.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109141414272760.pdfIn PDF document text
    • https://ptogel2.com/contents/files/dafonig.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/motetomopugexabomosodebe.pdfIn PDF document text
    • http://ned.ru/uploads/files/vebeliwumifokavulaxe.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210918145357_glcy1d.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/velifiwukefironefemujon.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zadumivemaguligopareles.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_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 18604 bytes
SHA-256: 2ffc93193650bb88ede499f2118fdc762c30b1c3e7789ee2cc2cbd7ed9082882
font_02_sfnt_off00015f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4B 10272 bytes
SHA-256: 50eabb02f430aff22284998c09632f4e63a4d621890eeb16ae74a8bd9c88e226

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