Malicious PDF — malware analysis report

Static analysis result for SHA-256 516aee50fa66115c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 20:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a31875ccc446c120cd22a9ebb6b93829 SHA-1: 6b39f8406bbdc012cb50546b4804e65cb707b10d SHA-256: 516aee50fa66115c1c1611128d5b4ff2139c2b193987762e723261bfcaef3615
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=download+video+bokeh+full+jpg+to+pdf+converter PDF link annotation
    • http://oa30us.com/userfiles/file/29812305575.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/43812745847.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wazuzawopijomuxu.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/jitikodu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/5854488715.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89001811073.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/45183678647.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/titaxixazofonujamum.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/24132771936.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/63245964340.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sewimowufozanevozop.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/tanobuzedunimijiluguxa.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gavuwigagapigitu.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/jewinulazurutodoborarat.pdfIn PDF document text
    • http://leruichem.com/upload/files/84350491281.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210906_011626.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/49306117589.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/42390259856.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8cf6ebe61---13399223519.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cc2e6d7f---tobonuwukadezeraboxuko.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/nibizawojigadasezakuworep.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 17080 bytes
SHA-256: 20f239ef0cb1d35038f8d3bf2c7b32e693b4d4b3cfa36ebb260f528c96e2608a
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 11344 bytes
SHA-256: 3ef90617734a8e08a582d808e0d476fdfa2a6501ffffad9cd899673ff1d62f9a