Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa679faa09faec5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-28 01:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 757ece93389b9e11d21056a4de084001 SHA-1: e196c1cf4ad8af13f555878d60a9c4cc2ae752b2 SHA-256: 8fa679faa09faec572840e1eedadab1fce5345847b70d9a6df39f89f8d15b6cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://msnladyboy.com/ckfinder/userfiles/files/wotusogaketiwagolineke.pdf In PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/25872624729.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/binunogaxedugoxi.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/44428595444.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/mumidopanezugirorezoxu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/ronir.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/48925071503.pdfIn PDF document text
    • http://techmechengineers.com/uploads/kexodenitekoguromug.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/getijufetetogazede.pdfIn PDF document text
    • https://ms02bet.com/contents/files/94166896527.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/24347874612.pdfIn PDF document text
    • http://liluby.com/upload/file/zagemunufajebijon.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5c604bbb58420d0182bf725fe74387d3/letixiziwelukubikuluta.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/28946471745.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/nasofitewadar.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/56078054500.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/zirufu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xezasepekaw.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/21246551774.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/95474801013.pdfIn PDF document text
    • http://onelove.cz/file/64768360749.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/kaweto.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/nirukewojumezade.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c292b5ec1---wotoligolurawozomos.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/xiwaxasavuguxetuxepuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stream+phone+screen+to+pcPDF 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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 10576 bytes
SHA-256: 96629839c5e212687e4ed1641643c09bd580b69718658e65742d384ef065d878
font_02_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 17928 bytes
SHA-256: 3fbd8cccb9c0e1ac7e521d7fed095f47ef200610bd921c24042866fcaba55129