Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9807a99bc004d1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 09:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6c96f4addec98320186846e942dc71f SHA-1: 94a0d7d181d86e3401a4c3baeafb08407b83188b SHA-256: 3e9807a99bc004d1998a925246e12059e1c2cb0c9579f379b94b67bf36efe616
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many pointing to PDF files, suggests a link farm or redirection mechanism designed to lead users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=how+to+free+up+space+on+internal+storage PDF link annotation
    • https://eltonltd.ru/sites/default/files/uploads/79399751168.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/simotusivuzobifisomif.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/66456352675.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/48078562694.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/59913524276.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/baluduzowudesoxuzavere.pdfIn PDF document text
    • https://vendax.ro/files/file/jijegokadomexofisaxifi.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zuzasulofiguzijukedaviza.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/futore.pdfIn PDF document text
    • http://ceroki.com/image/files/11978972081.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/70260672671.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/40699363302.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/dumat.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/70424501830.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vozirupiziza.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/bafumabamowufap.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/96987997050.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/sexisurifigufufixoresiros.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210902170731.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc382e42c---gitosumebijijajogipobenim.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa2115938---renupodemidigow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/naberebivebira.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/81011434253.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_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 10832 bytes
SHA-256: 3a3f7893a2d215cbe224c8ffeaff893553b1d200f5b55dce71c77533cc1cb0a9
font_02_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 18580 bytes
SHA-256: 99e154477b7e8333eeae04b816edce26a9f3b9574a065d2ad3d3c0b3cb283689

Open this report in the interactive analyzer, or submit your own file for analysis.