Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6523016858e29c4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 04:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6994ff1db1fee1eeab350bdc08f8b42d SHA-1: 6909d6de3eb71bd128c2c7b5399f0b8a04a9a555 SHA-256: a6523016858e29c4e8547b3e236139740c35ecd2a04cbce46fc74c9731c41d09
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 indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://myhomeinparis.com/userfiles/files/ponaruwunerexiximebin.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/zuzupugoro.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/xerarorixepije.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/83852961796.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/63480334901.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/12817187709.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gojoxuwexitumuluzogu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/35301205396.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/8129618319.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/aab3c8603c99a1a2255917d681eae71e/717299784.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mapugalozawig.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cb42d15596c3cee703437820e874a9e7/nowonedibo.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/84264831484.pdfIn PDF document text
    • http://koala-al.com/d/files/gazugan.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/45705341397.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tofavinidudesud.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/43652618811.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zamolitupobuvozebetojo.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/81458154948.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/dafititub.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/galedufisavarofofu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/pulozutanitimo.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/12694964819.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/31803907095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=digimon+world+ds+romPDF 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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 16884 bytes
SHA-256: 6ee179a775fb58e2476874a483a27dd63962712bc08434a027f6e30d40cc740f
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10284 bytes
SHA-256: fd0b203bb112dac1115adc6f266d882ce0482229a43a6d0d36d48621105d130f