Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda080a85401d837…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 07:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90d9d9b6cde163890f7b1e924de49e9b SHA-1: ad77f2b80ccb8b79279582175b05feb8d454152d SHA-256: eda080a85401d83716db4f96c12d2aa19376d224a86c6d48404202cb392fab70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to unknown domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.autopsrus.com/ckfinder/userfiles/files/580322788.pdf In PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/muraguvefafepokip.pdfIn PDF document text
    • http://rsentco.com/upload/file/zevatonatipozenereduze.pdfIn PDF document text
    • https://matrixx.lu/images/lonamabet.pdfIn PDF document text
    • https://maturana.cl/upload/file/vuvojepivepesalekeze.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/91848418285.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3672a961---rumejekef.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/bobegebogagaxepawig.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/13254332594.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/93727824179.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/lomuradikuz.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/25932266534.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jalowewederumopi.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/xibuserogu.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/39081282414.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cb4be0ac70e4ba5e861bd632c4492a8/supefonabisajowaropox.pdfIn PDF document text
    • https://alohasafaris.com/files/83407121851.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/50740736285.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vudasavise.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/filavixutanivim.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/81840729071.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/13924154374.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/lorujetub.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/18559203706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargas+para+android+juegos+gratisPDF 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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 19228 bytes
SHA-256: 953fd005d18ffbf909972757798ff33126b8c6831089bbeca400b65416e51c11
font_01_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10872 bytes
SHA-256: 4e18d046704ff86ce70ab723f2dcd432e6833fce5e79e557b92b3c91f71164a3
font_02_sfnt_off000135b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1