Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe8cb237ef4d3b0…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 20:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79388054095a227408c57a25c35d4146 SHA-1: c39e20c832d96324b9251cdc3f1b3fa82d02dcd4 SHA-256: dfe8cb237ef4d3b030a18941932fbe4d0786b7b548fcd421f3f0ebc10dcac154
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many hosted on disposable domains, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=meaning+and+definition+of+curriculum PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138812e60ac1---monejugenogefujote.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/84432401559.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/16893548704.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/30942278690.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630722026.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3a17da6---984743745.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/11769887259.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fizimerirafok.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/164265863.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/58044586174.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/59468760943.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/73693169014.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/14739120167.pdfIn PDF document text
    • https://teamcode.net/upload/files/ledilozegusiv.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/31071601672.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/80050089060.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/91932056661.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/71229742363.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/39143841591.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/54912240403.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/fusawi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/begenufabojemod.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/34260965100.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/93830048682.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/86540242423.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/92291800548.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_off0000bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 10744 bytes
SHA-256: 77dc23fea1e3d9124b3726ed9759a5121b72c2faf4614ae6c45b6a2585da38d0
font_02_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 16788 bytes
SHA-256: 0ae7d8a6cfa4023b108efb0842a7ec9009b18c4c657885d0fa02dd1a691f8233