Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eec5dcc71d1298…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 17:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d264d9dde94dafe729c6660bbf52f5cd SHA-1: a79c40f7a42e4a97e16240bfb963d3c204301a4c SHA-256: 16eec5dcc71d1298d411fad73b762e113fa1e9630a669e96f9646c54c7539394
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a high number of external URIs pointing to link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://ceomit.com/fckupload/file/4300568652.pdf In PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/69106901642.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dogola.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/2639900011.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sekejazesejefilufenizi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/tafesiki.pdfIn PDF document text
    • http://reopen911.info/media/file/fanuxafep.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/femosazeb.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/fifajomifezoz.pdfIn PDF document text
    • https://jss-moms.si/upload/File/33616954938.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/defezokazitok.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/fojeguxadewimozuvet.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/83730801017.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zumabegusawodusejatato.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/50290204121.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zolepubowobekivabegujutem.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/50344841865.pdfIn PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64175200931.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/karopitaxililajudogoj.pdfIn PDF document text
    • http://imaginove.eu/data/Files/donudesodeguke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=final+doom+apkPDF 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_off0000bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 10124 bytes
SHA-256: 5f7c16625bd7aace6368d1c31835e339e616e977dedcc59ddbff5fd5c75d4e8d
font_02_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16348 bytes
SHA-256: 87e68304e6ccfb8e9399a697bdbd6f31eb4fb6f34bf030f095762e6d40ca7e06

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