Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f19e623b093d736…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 09:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd71bb0d07b8b9aaabc6a9bee0509984 SHA-1: 76eea3eb3f753ba4f597abd9c33e22d322c40415 SHA-256: 5f19e623b093d736473724300abc082d30fe31a67151eebbfb7abede2cca1740
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct and potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/noxiroledu.pdf In PDF document text
    • https://hinaweb.com/upload/file/gijizudutibiruwabemaz.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/36223177491.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/48819622687.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210910163707.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/85613103908.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/zerajimuzakoxif.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qbl077skcf2sbr05hvunodfpii/gunoleda.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/semuwalurilizowijewiz.pdfIn PDF document text
    • http://agro-partner.com/Image/files/48016480651.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10120855501.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/96364414996.pdfIn PDF document text
    • https://tarsiman.ee/files/file/62607631494.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/60542016811.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/4102873406.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161342717f0718---lumewubem.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/011345091755.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/88243089189.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/watutidugiwalesopuzibetor.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/velifiwukefironefemujon.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/guvasololuro.pdfIn PDF document text
    • http://kftchem.com/upload/files/wosisumu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161340d5446b52---muruzas.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/lofaziteliwid.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/44766817439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=e+squared+book+pdfPDF 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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 10612 bytes
SHA-256: e5ef141fbe1d6d25c671a0c7a5f1a6d25150cea80bae909208f6a113f8b5c1bc
font_01_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 16460 bytes
SHA-256: c9f8ca7e875c9b6f92263f6d8c7b425895705c24f3e25e280c893ae084bd9f0e