Malicious PDF — malware analysis report

Static analysis result for SHA-256 242414bffbf9a514…

MALICIOUS

PDF

76.3 KB Created: 2021-09-29 02:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e814405f4426249b24ad5c8858683d10 SHA-1: db0e4bff5f88c1d0d197bcfab73efc2d901d4d7b SHA-256: 242414bffbf9a5143d4bbfb6e2569839adcfc221762d862b9fe5171e995edeaf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution to facilitate the download and installation of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://oniceh.ru/uplcv?utm_term=watch+jurassic+park+online+free+putlocker PDF link annotation
    • http://studio-rivetti.it/userfiles/files/gubarijit.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/jukudelota.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/12471753207.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sogijezajebodazoxifovidir.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/lowubesomumakon.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/zurogegajabusokozizot.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/gifedapineliresirarowiwe.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/mozaxatejan.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gejatuz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/20886bc2360cbc037c3711b195a45b8a/43148329727.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/majemubiwuzomononozavire.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/zefaralolodimabixexexak.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/87910142962.pdfIn PDF document text
    • http://epmachine.ru/d/files/79655325969.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/58546096203.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xewepinutipafe.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23279590998.pdfIn PDF document text
    • https://bliznacite.com/files/dakoragoworupegixidonij.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/pesurituxarunuwaribubibak.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/31108330319.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/mokizus.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/26257753833.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_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 20968 bytes
SHA-256: 96f68e55f1adb31ca858a956ef2d7b3f803ab13314532a679ba92b766e469865
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 10892 bytes
SHA-256: 59b6ce0bf43746e59c516b3457c3297198fb41cffff9d9ddc58670b84636c303