Malicious PDF — malware analysis report

Static analysis result for SHA-256 996b2648bcaecda7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 08:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d157e666f3157f5347d7da7c58319a35 SHA-1: e78969fcfc89e5e5b032c42693bdcf95cb6fc9b3 SHA-256: 996b2648bcaecda7d54a1832b22eb031f29d61ee0322926f32a9713bffb1989c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.aukuras.org/ckfinder/userfiles/files/19831023067.pdf In PDF document text
    • https://cncostruzioni.com/userfiles/file/doseguwefupuwen.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/20076766206.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/43365936135.pdfIn PDF document text
    • http://kisito.com/userfiles/file/68435576128.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/netovadedosareri.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/25932696120.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/86886093287.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/5370168102.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/73549345584.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/85566142577.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/79acfa285c598c3a76cee574df98ba4a/24072946530.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/75261570494.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109131935543615.pdfIn PDF document text
    • http://xhzhengli.com/upload/guwibi.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/magafe.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/bokowagajakenabari.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/23609627270.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/dofefal.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/9933611585.pdfIn PDF document text
    • http://exima.kr/userData/board/file/69372859166.pdfIn PDF document text
    • http://espwireless.net/uploads/file/rorunivukunurib.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96375775812.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c8f01083d1---sikaneravuvosikajabaf.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/61586268681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=harry+potter+tamil+dubbed+isaiminiPDF 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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 19528 bytes
SHA-256: 71376eb32d6cbb865c8c3ae0d6f4f92ab17116320dc44526c28d0d4d3bc485a0
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 10900 bytes
SHA-256: b64723cc8c962354013d09dea30510533cd1264f3646513e47b5085b4b903596