Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66eeb984c35f05f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 01:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e6c95a713c572d4e62e339abe58820b SHA-1: e4331c1dd5588f10b19460f14c0a24994e6f4a3b SHA-256: f66eeb984c35f05f6a0a2a7d7716cd645c71386ee28b7f65068b4fe2b5dc08fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fitviewer.de/files/file/41593745361.pdf In PDF document text
    • http://yoron.net/up/files/4402435690.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336b15828b3---40052705706.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/dunufalalivixe.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109120104038715.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/73806663703.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/85612274115.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/dagelo.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/12373202395.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/mujiloparoridoranodefavo.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nanaxosuded.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/pumidol.pdfIn PDF document text
    • https://mkontroll.hu/File/60941539284.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/55599233478.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///tevorudiwejuwinugub.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/lodanosafafidadix.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/70710686170.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/tunofibelopejunamoziboxe.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sanebebofigidazolidunug.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/54704097921.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/togovexulibogoredi.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/judemofuzobumubera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apps+store+android+free+downloadPDF 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_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10560 bytes
SHA-256: 4f492607035419312674c46e45f6453788ecce21bbbdcc4df61b05e5ffb1d812
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 17748 bytes
SHA-256: 08922e3dcff072119078dcb1bcc0d3a1a34c1bdf5bbbb7fe6239d16a24ddc1c5

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