Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae78b113ba4285d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 22:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4174a608d27ceb9f852ccbc7780359c3 SHA-1: 64dd94c06dc1f31a816d4d47e5b17b0c738eac76 SHA-256: 8ae78b113ba4285d80778c36f6e8e1581d70cfbc27c8103259386a6a569fc680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://recit-de-vie.fr/userfiles/file/97387021763.pdf In PDF document text
    • https://floridagreatescape.com/media/file/25749625401.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/dozezamixobafuwabexetigaf.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/mowedifaludonireregil.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61401d6b70b12.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/dejudijuvofepikabet.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nabazidumukigonibuzoweki.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/puvisofaxajipidovosipav.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/taturodagasogomavesapur.pdfIn PDF document text
    • http://silver1979.com/upload/file/fisisedi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/rk8dvfc34maor8seu9k9hjleea/65141277025.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/45262062253.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/dekutiduxetanaf.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/31222883947.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631557771.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/49836375612.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/9120950707.pdfIn PDF document text
    • https://sambelteri.com/contents/files/sapiwapamewofesegipa.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/jipajopojerezeli.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/romubotekari.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161442ead90a35---61068360546.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/37191226683.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/78690009629.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pibegedomufatusodedogawe.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19407766533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+bloquear+anuncios+en+google+chrome+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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 11136 bytes
SHA-256: d4ec0b9f0a5063ecebe886ceabc021f71af635e3ea0d6f4e391810fc913fe213
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 18488 bytes
SHA-256: d4bd8a66af8c67059978109c0ac3b88ac0d0a128a8996ada3d6e78e5917c686d
font_02_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1