Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dff6fa49a63cba…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 00:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1742f73cd63e551633e69e34664fe53f SHA-1: 1187971bd14d48b6bfe594b1cea10db12a6b7591 SHA-256: 16dff6fa49a63cba25167340d07455ea0bc827fd357ff849a7d5d39d7ca6cf1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://krisoc.ru/uplcv?utm_term=sword+art+online+season+2+ep+16 PDF link annotation
    • http://weiken-rc.com/upload/files/lupimebuwijeburopuviralex.pdfIn PDF document text
    • http://masonhn.com/d/files/97632331058.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wexojuleg.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/titivikubotetebokevagavom.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nimutigegupekuvetetiva.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/64691042606.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/26648803643.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/50427817198.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lelaferavubogewosevabepe.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/86503089842.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/30702750911.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/detoradabegemevesesujoli.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/jezitifupodepelof.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/sezuvetitaxofuzufideruga.pdfIn PDF document text
    • https://rm-parketi.si/uploads/mofevesoxino.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/nexobavuzexulil.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bapipatemabewarokataru.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20167047758.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/83801903296.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zunawa.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kedasipigeni.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://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_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 21172 bytes
SHA-256: 399c24f04db6f0fdee8509c1c2e152172badff96a32cd8b4d35868608f1e047b
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 10888 bytes
SHA-256: 30cb38450c5e34cd3d0d86b03a1e2dcf509d3fb7de63efbf463e946eeb830352

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