Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21233674cf276ba…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 14:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d8379f5d2cd6fb7a4ffeb449b823cd2 SHA-1: 69f18997bf1045fe184317f67a1d37d064f69e28 SHA-256: e21233674cf276ba1060ad367c72fcc9cba628a395e84b2e4ee7bc523b5a9419
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious URLs or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=why+is+my+phone+not+connecting+to+internet PDF link annotation
    • http://sweet-sugar.de/images/uploadedimages/file/jokotalepafuzabebepanezud.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/45449297938.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/3343078189.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sajufovadoduji.pdfIn PDF document text
    • http://195exim.com/datas/files/51615251818.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/vagedosolafogepiwebovizu.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632008199.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210924003621.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/34434875230.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/10382387507.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/sesezazugepamasumumil.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133969925745---bewurebikafiz.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/79122569341.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/62760588524.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/99886058920.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/60940939839.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/83094551388.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/81540149765.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/61479310189.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/35255859251.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/73666444857.pdfIn PDF document text
    • http://marymo.ru/uploads/files/lilaxo.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/79938118902.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/19321828844.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847f28c79---ditorexaxi.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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 10720 bytes
SHA-256: d079c4814605dced54d3bd561a6b6508dfa8576fa3a6b12e74bbd28be6be56a0
font_02_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 15208 bytes
SHA-256: 2fb11af867f387f9dee97e31b7fdba9f42f3b293f71daf909fc6add4ecafa08a