Malicious PDF — malware analysis report

Static analysis result for SHA-256 8868ec149b20bb87…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f69823c1021164329e8f32a5f901aa1a SHA-1: 6487f5280c0ba72b5bb824ffe261e251ad7c0888 SHA-256: 8868ec149b20bb87a31c2c64e06c799d497094d0fefa6c2e1912f47d5a08f271
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is a link farm with many disposable URLs, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/wunikonamuzosen.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16132607cef38f---bemiwi.pdfIn PDF document text
    • https://tepihtrava.rs/files/31045395272.pdfIn PDF document text
    • https://cooperspick.com/files/nazubeworemaxojudepa.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/xiwamosamomavododukas.pdfIn PDF document text
    • https://preciseenergygroup.com/media/24860071313.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/41802389393.pdfIn PDF document text
    • https://andana.us/files/files/kukukemedipaguvifumovar.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/wukomeger.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/gibarotaparaj.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xesubekudulitamivoko.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89578835521.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/pezalosipitiwowanuvuvadi.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gudedalulamaki.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zirupugato.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/39919149979.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/65615709620.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/rupis.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/39618895659.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/fimufejogiwapalujukemagow.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/78402311241.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/galim.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dosawesonowuxibuxap.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109022016356686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clean+status+bar+developers+apk+downloadPDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 18288 bytes
SHA-256: fb6944408289695246d30493f38213745845139dc9291dbb5b6defe64c118753
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 10808 bytes
SHA-256: 6f407df76ddad4157a72e89f872d62efd74b419a0af7aee424a67900f70a0661