Malicious PDF — malware analysis report

Static analysis result for SHA-256 204c16fb12d569de…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 07:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 87da7f2416919a8709bc1b3d80a5d1d7 SHA-1: 28efc3bb16c98518e04e744771f5e043781653ab SHA-256: 204c16fb12d569dea5687730b4ded5b92b3b9e8103b8d61872f686bffdde68a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://learningkey.org/userfiles/roronolasuxawusu.pdf In PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/nuzunaviwilunolezabumomor.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/nuvaloposuro.pdfIn PDF document text
    • https://norservis.cz/files/files/20750909320.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/wuleruruna.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/ratasujabo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/9055494905.pdfIn PDF document text
    • http://findusafranchise.com/files/files/junuderidogij.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/jilujavavifuxemitopanagif.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/zuxukubotosewegizele.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/zomitu.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/zarumewilewen.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b2ddd3b9---dotilikov.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/tezelaxezikagewazazi.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/75893184523.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zimin.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/jimoxuraxofosatozoxali.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nafutilemutakazetof.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/madidevetutavugijam.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/wobutinuginipasel.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd8728948---56010327281.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/1141997582.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jetuwevuzudiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=doctrine+and+covenants+institute+student+manual+pdfPDF 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 18300 bytes
SHA-256: 0a8f2411d658bba89bd2e87a27479a53680223ee6e81c7524685667b963c3cc4
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 10948 bytes
SHA-256: 6d8b8e093ba48e0c86f77b28f671a4fee163b3ec1b95ebe68346ddd06ff0ce3b

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