Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b2ff364be45c5f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 10:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0199fad5a70ad089bc00a9f71276503b SHA-1: f0e4adb4523f32dff6ab664dd32a745d4a7fbe11 SHA-256: 38b2ff364be45c5fbdcc5f7b7650ac11a41b30a435ee70de0dfd70d672c8ccd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://musicandyouapp.com/webupload/editorimg/files/44662837378.pdf In PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/71102526551.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163229988475396346239.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/83953555108.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/96465392900.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/nuzanujudujo.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/jubiboxepebitemuf.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/danutukenebapibe.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/wunozewafi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/51998152385.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210923_030307.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/13896599333.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/maxowowitonebexojagago.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/50649287587.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b30458dc2---40273830673.pdfIn PDF document text
    • https://subarini.ro/mm/file/vumanujed.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73960613403.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/24423429992.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/duruxapozajamobujabebibin.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/60979619603.pdfIn PDF document text
    • http://elskenecologie.nl/files/veburepabanipevix.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/16076473109.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/rixizevi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/73927273181.pdfIn PDF document text
    • https://wittnebel.dk/file/79751374301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+illustrator+app+for+androidPDF 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_off0000b725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 10712 bytes
SHA-256: a9235478ca33f1bc38986309eaf0d788b80684021dedb039d10a79acd310a636
font_02_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 17752 bytes
SHA-256: cf60102d13414659f6a4cbeb971a973e2a1db931e5d3e20b2a7d4a1aafa54a6b