Malicious PDF — malware analysis report

Static analysis result for SHA-256 084a6f6d7402956d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 22:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 690607f651e023f7f74f9cbdb2a28086 SHA-1: b5778d28497842d447adb9de87c3d727aaf4df03 SHA-256: 084a6f6d7402956d30c0ecacc10a6566144e64f002fabca413c5815161d77f89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to distribute links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests it may be used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://superpart.com/files/48367334174.pdf In PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/fikukisitimumaxebovis.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/67001427496.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/luvopabelukopo.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • https://buyafranchise.org/files/files/36367521386.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/webeziresomupusizipesa.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/17380671914.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/gomopegofefupow.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28642234754.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8dac0a07---17205118365.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/82464980902.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/36638982354.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/65219233004.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/rupaxujuxuzewo.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908052509.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/pudom.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56d9e5673---79131859811.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/26554573357.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909160747_1107647742.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/90521511543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+one+minute+presentation+pdfPDF 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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 10780 bytes
SHA-256: dde8bed285cde8bb12e2e567da38a83ca4f87508b113aaad8232db81676cd094
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 15436 bytes
SHA-256: d91b6488f91c0e08ddf9e48565363270052f844a005c646a33d8acaea450001f
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1