Malicious PDF — malware analysis report

Static analysis result for SHA-256 57121aa9d6bbf045…

MALICIOUS

PDF

81.1 KB Created: 2021-10-08 17:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e139cb0a79d9c02cf677f4bdf751d568 SHA-1: 1ca9d26bc18385cdbd1ee7f425ecace79f4cdd39 SHA-256: 57121aa9d6bbf0458f68b6b4b1eb7ddc01fc07c7dc0e11b28e1879563d15ec5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious or deceptive content, possibly for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://playitdirect.ca/ckfinder/uploadfiles/files/mojuxazewazikoga.pdf In PDF document text
    • http://surveycook.com/upload/tmp/202110/file/memagawik.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/muniwazunurofi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/gepitigozinumozus.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/94115192742.pdfIn PDF document text
    • http://flirdining.com/uploads/files/fatobeji.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/13646081208.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/refalawetukidowub.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/57889397963.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/fifozubozezerajukira.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/54507082534.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/91418518925.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pibanelagobowev.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/nejib.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/5316396511.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/tapuminutawexaduxixun.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/82132003632.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/bakiwojuxifokus.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/13936251594.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/dozatuvofa.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/paxerekug.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/xenuxat.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141657886475---melitasiti.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/bivatepugumaman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rtd+resistance+to+temperature+formulaPDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 19060 bytes
SHA-256: 3eb366fa11ef530e1fbea929474e3fa2a849ec5829a2a65c1969b4ceb989953e
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 10928 bytes
SHA-256: 81366163461d543b6bcdc6bc7d7289574f919af604a11d97491ff481248b03e2