Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b1cefa0bb12e9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 18:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06abde382f19ef1bfe51f46debaac003 SHA-1: 962eb82a18f702bf7da932044f98e20a6cb2b117 SHA-256: 8e7b1cefa0bb12e95cb3ef8faae4424554229bc06f9ec457fa9edd7d17bd36b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded links likely serve to redirect users to malicious sites for further exploitation.

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://cructi.ru/uplcv?utm_term=12th+science+chemistry+textbook+pdf PDF link annotation
    • http://driver-jazda.pl/upload/file/lisebagelu.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202193129424856.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/45228622915.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pepita.pdfIn PDF document text
    • https://rm-parketi.si/uploads/pagafobu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54255138170.pdfIn PDF document text
    • https://mklaassen.nl/images/file/93495984076.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/78382036594.pdfIn PDF document text
    • https://adikmanis.com/contents/files/12889733284.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/19774473700.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/nazanufixivejosubiropuxa.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/4496591029.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8690c9d751c4ef4b8521dafcac912b13/91386620557.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1a1a2ac---45005541594.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/37961075797.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/ragutexu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/deden.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/63875138547.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/51259872322.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/87120374373.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210911212237.pdfIn PDF document text
    • https://stvorki.ru/files/file/6925391573.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/35867650570.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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 11200 bytes
SHA-256: 5a23537b886e83075745ccac308157ed96f85a0563550bcae77374cfe73a7534
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 17432 bytes
SHA-256: 42ea74075851a4e6b89576c16c75142674197379ba0b55fa0cf1bf198382f38d
font_02_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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