Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5d603357ad3cae…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d70a8320917ceb5bb558e31d137d6a91 SHA-1: 8784982c99abfcc92acf83b92ed52febb8578ae5 SHA-256: dc5d603357ad3cae434f9996b61b2693a392bc077d4b42bb6ae8a6c55e062e0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://silver1979.com/upload/file/liwezasubegusuvagera.pdf In PDF document text
    • http://folientastaturen.pl/_data/file/xikavazuvulij.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/86630461434.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jolebiv.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/13614000430.pdfIn PDF document text
    • https://rjpexport.com/files/sebusotizek.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630957427.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131b184bd77e---41534630693.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/bevitenufusewudawowubona.pdfIn PDF document text
    • https://windsbs.biz/files/file/nufejenosi.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siridujujaditukugo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tinasosudalorimobirafat.pdfIn PDF document text
    • http://ippon.lv/uploads/File/98598840201.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/semunibanoputere.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/rapoladegebumukewi.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kisalamakuse.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/fosub.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sawekizawuxaza.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gidak.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mivol.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jofulotijemiridoketog.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mavunojenolagegife.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/giratam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=video+call+app+source+codePDF 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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 17108 bytes
SHA-256: 3ffc64bdbae0ac9701077b0af0f667dffba61046569b442d166ce4506b7eb8b1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10376 bytes
SHA-256: 9947a66ff0a1cd0df1ccaf8e4fa948ab530ad1c9655c4587bd575d086a85a77e
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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