Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aaafd1a81ef0382…

MALICIOUS

PDF

68.1 KB Created: 2021-09-11 01:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bf9a3448125dcb2a929cce03205ad57 SHA-1: 20bd4c191974f08d04ce36fccf5e98abcb0952cd SHA-256: 2aaafd1a81ef03821280d8f8c1516b1c0580399ff88a2dd771f1e50a2c644bcc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for phishing and malware delivery. The PDF also acts as a link farm, directing users to numerous disposable domains, many of which are likely phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=emojis+free+download+for+android PDF link annotation
    • http://kiiga.ru/userfiles/file/78153188597.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd6c6aa5f---43721908911.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lunufajedavixit.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/robobenamazufix.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/30770938967.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904202830.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/57111874220.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/88007150890.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/18840908599.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/lajaluloxoribafavegofod.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/ligobosomoxus.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/febebanojirotajivejijupup.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/giporamoraripejunolug.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/14875187920.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///79974511021.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rofivatirotageso.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/zebexitapijoro.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/23909293860.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://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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 10616 bytes
SHA-256: 8907cd10c0f3c6e96c06d71b0b77a8642a1fb3fffac10ecf983798b1b7833daf
font_02_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 14444 bytes
SHA-256: 190272c3fbfa3aa4d98aee66302e66d74b7d88fd93232db67955807c0934e64e

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