Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a11d6ba861c0ff5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 23:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5740d5720e7a209e80789d4620be2b6 SHA-1: f8e817386b0278165fbfc94069c2accacf47d1e2 SHA-256: 8a11d6ba861c0ff5e67651ac8d72ab67359fddec83315bb3eaf2accbf8dab6fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document 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 point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. No scripts were extracted, but the primary attack pattern involves luring users through these embedded links.

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 https://synerhu.ru/uplcv?utm_term=aim+tool+for+8+ball+pool+hack PDF link annotation
    • https://taptigrihnirman.com/singhania/downloads/file/gagerixubigev.pdfIn PDF document text
    • https://asken.as/bilder/file/10866513776.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/kejega.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/64398739745.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/ramavisotafimuwaj.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/61185500238.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/lexaze.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/nobopomixokamemo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vipumixigivalosage.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/lerokogemozavanesozerimi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462cc4276c3---povivaso.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/22244351005.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/reponaponewupowetobujori.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/96281156925.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4abf316d6---40384359898.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/puvunomuteja.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906043831.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/86216977689.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rasilizuluzegirovajadab.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/50409812193.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/46061980820.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fapunuwidimus.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/63854637853.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/89629882562.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xukefep.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10760 bytes
SHA-256: a945bc76887ae4f2f69dc4d054e1a9e016cb8c6a271a0218d1144960b2a050ca
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 17148 bytes
SHA-256: 88a8e202dce70fe3bc9876664f5a8dd953167fc001c6f68ead508b301eacdcf4