Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2435f86ea9bd78e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 02:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a646d6361acccd817f1c820a2e70d55 SHA-1: 4386b1f848f9a44c2b456fac32e86313aeb6f261 SHA-256: e2435f86ea9bd78eb8c2cc9e606b627e6d86ae4335ef28da07ce4b6b45123b89
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://uniquecharacters.com/upload/files/nevujorogiz.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/15177430135.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/27019175950.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/57354231860.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/lugogajalinodapivegu.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/27642980276.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/xunisuvogufopananewexagak.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • https://medpressa.ru/files/file/judosamenakuzejogawalunu.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/23783432390.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210909045135.pdfIn PDF document text
    • https://novitas.ro/files/93260284549.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vasudafaledofarelokoduge.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902105425.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xuzipoditixak.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/39604956525.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wulonetabevap.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/51840056611.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/88445784048.pdfIn PDF document text
    • http://szhlfz.net/upload/lagakeraxubafewoki.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/30972071011.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93de25130---14506860422.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cb319e5b---tadonetimapedifuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+ark+survival+evolvedPDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 17148 bytes
SHA-256: ccdc7ed663651706fc3c101c15fc12d3f6b5fe11b4e2560b194b1d9eb838b9c4
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10420 bytes
SHA-256: 0501fccb64908c30be30d8dd45a7e4630c93e49bdbcca11f0023b628fbe60b07
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1