Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a81805cbebaa38…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eaa337809ab43a51b54f5a2612612232 SHA-1: f871c0b66fa3c9a1840266ace9f880f9d60e67da SHA-256: 86a81805cbebaa385f402b15f4f64848fe20c6456d9d2271971390c2f2df6cf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous distinct hosts and embedded URLs pointing to potentially malicious content. The primary attack pattern involves directing users to external links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://ilonew.tasksplan.com/ckfinder/userfiles/files/88275916312.pdf In PDF document text
    • https://prtl.pl/userfiles/file/94501863692.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bosidesotivozudowetara.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vufeberotivudojebalo.pdfIn PDF document text
    • http://juentai.com/userfiles/files/45410583188.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/tatekup.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/63078362422.pdfIn PDF document text
    • http://4darchitecture.org/img/all/vixuvedusizatitorolases.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/nasezisefigowesoza.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/rimawane.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gikiwoxekizedifisekeves.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/44229498168.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nobirepimu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rafuvakaduvajula.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98e639a13---20136971908.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/koxagete.pdfIn PDF document text
    • https://menu2uplus.com/images/file/patera.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/1593882465.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/38695185678.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/javirotipom.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304fff86a2a---65038265425.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/7909748265.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rezuriludulasorava.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+android+phone+manager+appPDF 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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 10848 bytes
SHA-256: dc9e55fb7c1f00de8207a618359ca5ebe3885d1fdaa25f4173131478fb8b5922
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16116 bytes
SHA-256: 6013c260a4a6120c312864a1445d235669d3e4e9ce5f0e5374bd6d5ebbd17d8f
font_02_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1