Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ead0f56399b988…

MALICIOUS

PDF

77.3 KB Created: 2021-09-28 00:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1480f12893770b77f10ed4f5c8e86c5 SHA-1: 7e764edf664d1a6f5b92ffdb5fdbfa0860ae60f3 SHA-256: 39ead0f56399b988644b9298f766a575c8ce149011882fea42c6e58853f60b41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://wtmongolia.com/materials/file/49781669414.pdf In PDF document text
    • http://dblbtech.com/userfiles/file/vigisutewifule.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e1ucskj2eo6eb1p4edksop57m3/kajex.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/kojavefivazalotonefivi.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/51615628772.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613468b815021---62483101337.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/563065191.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/50024653753.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/jusawijaruwon.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wurametapof.pdfIn PDF document text
    • http://learningkey.org/userfiles/guwafabotatuxu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/menagowenowivanisazila.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210914110156162.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/82709971754.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/33274221950.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/50107870477.pdfIn PDF document text
    • https://siroyensao.com/upload/files/6496926874.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/geguwusozifid.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/veraraxuxawubeka.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wekogatevovibugobonewap.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kosixeveraxitozu.pdfIn PDF document text
    • http://offerparts.com/upload/files/65348362437.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210913164735_1771077039.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/tekesimuvafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+things+you+see+when+you+slow+down+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_off0000c339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 20088 bytes
SHA-256: 320a4ec5e1f93ca44e981848ae857b7cd062b31152c529f889d83b641b20c141
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10780 bytes
SHA-256: b71211b6231993a286131c844dc9c2c4fcb8f23c2946889495e377f95820ff41