Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d934fbfe4d3d07…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 23:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a9d12dca56a350da5a78f4dcaaa95ab SHA-1: fc8d0abb4590a76c4c71532a803977d3492498b5 SHA-256: 08d934fbfe4d3d07c602e7f450899eeabe4e79a75d6812c819fd4fc6b21a0d1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or downloading further malware. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://losaltos.com/wysiwygfiles/file/nigagilev.pdf In PDF document text
    • http://horizonpestservices.com/userfile/52537224415.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/50122134972.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nuzutajor.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/jiwilozibabu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/67865605005.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/aqi4dqi31m7pco8s25lndpjgnk/wosinagodukon.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/55389795969.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/sibusex.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/16222397823.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/juguraza.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zemawerololunisex.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/zizeben.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/24482962201.pdfIn PDF document text
    • http://koutingchina.com/upload/files/80129848948.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/93088416537.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/fasikagakukewajufu.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/bokadukofalegaludufenab.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/9525403443.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pufufamupusogow.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/31135276553.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/niziwesagaxozuxabidewebe.pdfIn PDF document text
    • http://jljemc.com/upload/files/60893428150.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/puruwarep.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/28591454967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=type+document+on+phonePDF 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_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10388 bytes
SHA-256: 664ebce0854799fb9431c991f9715ad0b57b5615850543bf638aa5149dbed0f0
font_01_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 18228 bytes
SHA-256: 4e0afdbbba522f82023e9ee54597f4a9100873a9a444603e13b30d288d83388c
font_02_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1