Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2bbb4f9555bb34…

MALICIOUS

PDF

75.0 KB Created: 2021-09-22 11:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc171e55dcf0bca3e647b46d18bb203f SHA-1: 0b72322595ef970687aa661e9fdd91b095a1193a SHA-256: 7b2bbb4f9555bb34ae19ea5ba585b8419283773cc2d063aa055cef5daee20559
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://truhlarstvisollner.cz/data/file/90083239325.pdf In PDF document text
    • http://studiomistretta.com/userfiles/files/93328532789.pdfIn PDF document text
    • http://tulga.ru/editor/files/41713900774.pdfIn PDF document text
    • https://gcs.kz/data/content/file/7066056734.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xanijadonadurijubezi.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/22844959751.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/bezovu.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/38769090209.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/33346660593.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/bawiradosezejituv.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161445f8313abf---60203802217.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109110910247481.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16144e2b618d57---86891681488.pdfIn PDF document text
    • https://citronel.com/userfiles/files/1562404232.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xorefefenilemetepi.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/wemugobilulavinokajimamo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/bufibezo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/mofil.pdfIn PDF document text
    • http://cl-pub.com/files/files/pofumofize.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67926382733.pdfIn PDF document text
    • https://satesayap.com/contents/files/43773060760.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/10768247667.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/82884719578.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/tipokotibege.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/ditolariw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wifi+unlocker+androidPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 10388 bytes
SHA-256: ef8e07f80530d7b14ebf5f9bb687fad9985d744369b729a57248cba8720e2c9c
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 17088 bytes
SHA-256: 225f4eb4baa76c15ac50668879bd3ba1000cb767790f235401e4f23bf181a588
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1