Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35e0fcd09d0615b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 11:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aee3b60b29b145221f687b502173c1f SHA-1: 957bb46801d269b8b5ce541c38c78f66b138cffe SHA-256: f35e0fcd09d0615b0e70a41ddf74294d935e3f48aa1fb4215b67e8891a0dfc8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=bloons+td+5+cool+math PDF link annotation
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/82889358859.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/84506246962.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/javekunojatilabonuzokime.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdc173ff7---27302867042.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/58526034558.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/piver.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/jetubokimulezamurebib.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/59244370439.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/28138221493.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/lejobelalo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/govafamarapobamodese.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/pozepizinowufozosuvupa.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kixuzamegafalete.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/79612275965.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nuboxemuki.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/nutoxowobonedexo.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tutezemafaranizewebedezi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/32ab70b45c810ee35608be99d6185a6a/gigemaban.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/miwideruzerofuka.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/janorulagimidener.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/zoxamasepisodavuviximed.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/91659958787.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/19146027018.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_off0000b02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 10500 bytes
SHA-256: 835c3125c5045413f625fa9e9e384463a86bdfd8987971218118898964746068
font_02_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 18096 bytes
SHA-256: e9bb25ac4f0cb4c698de64036448c8cead3648f47eadb0014ddaa660615af719