Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b7ec69ae7f3830…

MALICIOUS

PDF

86.9 KB Created: 2021-09-23 01:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 706bea90413b78fe005120b70b9e77cc SHA-1: 2d05ef046c32c874324f3eb4fc640c4de828de4a SHA-256: 51b7ec69ae7f38306e6d8cd4a0c8231dc3a5f55cd3f6d65ca1507e3feba1ec2e
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 numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+walkie+talkie+app+without+internet PDF link annotation
    • http://interreg-ipa-husrb.com/downloads/gobamag.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/xuvinefiderota.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wetizopakekekiwox.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/bekepuwazijiwijodines.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/86658918402.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/lupug.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59422077185.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gusiluputa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/42912258932.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/jetitemifanomezerifaxit.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109060637592628.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/21266885055.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/32156761230.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/66991829747.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pavurovo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7a0e315c---49856029162.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wazepewe.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210906_083042.pdfIn PDF document text
    • http://falerisztika.hu/tmp/11081683939.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/kedisorinegalepudisafu.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/mazifetizipekakawigu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1aac053e6---nowazedixuliki.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dobutukof.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/84233943854.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/40304763672.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 10580 bytes
SHA-256: 2dc5bf5d6b477630a739d6de5267728d8c45e4828e7fac6e42c5c8da7ed33e3e
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 17864 bytes
SHA-256: 9859e6ac2d93175712d6aa29f7d01481ba2738d53102c83a0eb0def9a39b33d0

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