Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5f42aa6647af04…

MALICIOUS

PDF

67.0 KB Created: 2021-10-01 02:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a28bb3f7e81ac93ce8c51956c9548ea1 SHA-1: 0ddaa80ec2c9303613378364e3fcfa55e00b1bae SHA-256: db5f42aa6647af04066a5313e4cbff9a3cf9b26c85db4811bbc722811b42366a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based phishing document designed to trick users into clicking embedded links. Numerous external URLs were extracted, suggesting a link farm or redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://metricgroup.it/uploads/file/nirifutapufef.pdf In PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/84676808665.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/mimeximosenaverafomu.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/80787528448.pdfIn PDF document text
    • http://armanetti.com/images/90235874352.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109132002524711.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/29741852364.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcbeaec82f---bobasejusipuduxataler.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/mofafokiketumajaz.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/87348185985.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/87339466528.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/pukikepikosetewopilax.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/81257510839.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/folasunusavojaripo.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_22_19_01_58_9040.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dbfe30ad---81049642406.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/rexifotibetig.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/jubavusujagapod.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/vosofuxotanigozifamuwu.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/68445996700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=xmodgames+download+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_off0000ab38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34F 10584 bytes
SHA-256: 8d9db1fd799c7c7c2367449934a604a921fde8f0281baf7e97857e2a23c53ac6
font_02_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 14440 bytes
SHA-256: d30dcbe0dc3a4bbfa6535da9e1e5413f69708cb0522026c5729c2e0a4a794f93

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