Malicious PDF — malware analysis report

Static analysis result for SHA-256 18567b3fded79114…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 05:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97f04fd43b8dd544b04abf41c4e3efe5 SHA-1: d3e7ce937f30e0297b28629ce82237e10bb7de9d SHA-256: 18567b3fded79114cd03feb041d2da0c2795c3b8925806c83d2677bbe35efb3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the ultimate destination. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sapsda.org/SapmaUserfiles/file/91206340465.pdf In PDF document text
    • https://istanajpdua.com/contents/files/73947160255.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/mixeregurobopidimaxok.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/jopezenewo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/52115241972.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/34435673319.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/65635955225.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/bipilapepazefaleforopit.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090205494152936.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/tezafarinajezimawib.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/djmpituiid4d9m6072crf2mtd6/jewivomalowavesuril.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/gizogogejajorinoxivu.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/bodofotujalija.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/26057616603.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/13468972337.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/91582591673.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161302e4c19d15---86593412230.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/75631987553.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/2255548381.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/70069025292.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/sebexeluxurokijune.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/2538538124.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912221816.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zelilutilonezipesitejeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=area+biggest+countryPDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 18784 bytes
SHA-256: d11af5d1d5863b1283b85b9adab697c9c389022df42bc0a4b17d46f61fda4c19
font_02_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 10696 bytes
SHA-256: 556b51792ffa293931f429042863cfc3d0ff3601662cdfaea6d8f6d14633e286