Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad55abdd7da10bb9…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 03:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 766dcece8ed30486a32e7c292f156a8d SHA-1: 4cdd3ae3b4d50491dfccb2cb17b21895665bf6b8 SHA-256: ad55abdd7da10bb9375e73e59900dd1f20974c6da4d14e21f7668f26fdd4ebfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs pointing to potentially malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://pixomot.ru/uplcv?utm_term=openvpn+connect+android+apk PDF link annotation
    • https://mmagame.com/userfiles/file/99338227649.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/30490618194.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/93067885024.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/niwirimozezuvopilevopega.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/25640922991.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/84116331563.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21419996359.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/55762643948.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/977f6fe10427b5d1286fd751bbbd52b4/sokomifo.pdfIn PDF document text
    • https://themalc.org/files/file/11818683891.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/webaxofetufefadugozuzej.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sobexekosofadivejolevad.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/75832765417.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/69959207142.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/16278367947.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/pedimeji.pdfIn PDF document text
    • https://tempegaring.com/contents/files/65266099288.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109131030398021.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/tenuwofixadegofojaselo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5d60159f4e429ddca07856f20a55f4d/tolufalitevoboxokamipaxa.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kobinakuwagekobovajodumer.pdfIn PDF document text
    • https://mattress-leader.com/media/vibope.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/temisegomelaj.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/50222407538.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/22691986672.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/61247471687.pdfIn PDF document text
    • https://eetravel.net/file/5237170498.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_off0000b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 17596 bytes
SHA-256: d2055172587643b5e0b2431f5a8f025c1d4149edcbbcbe77de2af836a21043df
font_02_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10476 bytes
SHA-256: b77fbc8d8bd1ed6908368eb5f35a186d77b1ff4683c17b8db4401351001fc199