Malicious PDF — malware analysis report

Static analysis result for SHA-256 70be63d031805fa4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 17:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79272cdbcf480001a0cbdc67d06251e9 SHA-1: 34a8c6d5b8f4b25c891e751db09769f4bf63582b SHA-256: 70be63d031805fa4fe0c52c49e622947f262a0ecd5a7828136dad8bc35ccfaeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://mtecommerce.it/public/news/file/23748852457.pdf In PDF document text
    • http://showdoimovel.com/files/files/38413707720.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/19937773967.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/83111381309.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wigodavobijurevezitino.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/meloxinemutonozuruvatez.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/84358159697.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/jiriwosetif.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevuvenafedunivefifa.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/13834988377.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vagirojemubofokekilele.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/romorisimojutekalajeg.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tuvatogubofinixane.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88758535286.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/vepuxufobojojifobuxuvug.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/jokobanemerulu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210906163755630.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/sodapowenuzawawegemap.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/ratilotuxu.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/45967708500.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210913175921.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/fusede.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/josepelu.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/kagomodezoletunezavolek.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/32725706677.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/12345049189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kiwi+browser+open+sourcePDF 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_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 10380 bytes
SHA-256: e546d0112f0fa84f04e82c8cf2014157db8a5987256496770b2367c0c2e0e6d9
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 18764 bytes
SHA-256: 1c839af8a9e2dacbfa387fded466f1f7e349f2deaef9d52eb3bb7a60a992d719
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1