Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a4485e491a40e2…

MALICIOUS

PDF

87.2 KB Created: 2021-09-24 03:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 113963692a0b6c7b0c95a25f2f0d497c SHA-1: f2c35f746f07a244cb10dc6cec39a64c20189295 SHA-256: f1a4485e491a40e233f35041030e9ae32b2645b3e97bcaadce5b9843af2379a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thevalleytrader.com/files/19588742154.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/58947898496.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/16165666061.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lazevuzoguvom.pdfIn PDF document text
    • https://robertbah.si/files/file/87417822419.pdfIn PDF document text
    • http://vecsecity.info/editor_up/dumofutijikumobadimuz.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/57542709782.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c55ec3f2---zobesadisigudimetanixi.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/36885564863.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/7532620587.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/kifabizofosibonagezenoki.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/nigenigorexuxajuxavu.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/duvup.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/3294348615.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/3378344714.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143055f72c48---filufazoxapilasedolifofe.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/jabivunesadulo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/89167043547.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/romejojuroxewutuxizazafi.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/40712014792.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3675a59918495e52f48be6728ffcc223/6639610411.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/xolugonogalibisado.pdfIn PDF document text
    • http://aven.su/userfiles/file/sagakezavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+render+3d+modelPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/xojivazudowax.pdfIn PDF document text
    • 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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10136 bytes
SHA-256: 03e9583684a0be9e375cec25f3cdf4ecba6dad393a5ea234dce87a066b811b72
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 18564 bytes
SHA-256: b06bf93a08175cb180176155eef77d3b3b26e80181f598fe2a4203ba14b347d9