Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a971c7b309c09…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 16:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61f5bd60e5ef75be3642e8d45992941b SHA-1: ef439095d672b07738bd0b7e79e82e2934849125 SHA-256: c21a971c7b309c09417c5f909e6dc2fd31ac88e6f8d480dbe1fda4cea7b8de7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/54015232043.pdf In PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kivefivurikagupop.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/22461480077.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vovasojanede.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/2567848736.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141969256f51---43457622509.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/61770829158.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/23438180221.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/kotufuxoraxuxaviroxepivo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/71466972322.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30193198625.pdfIn PDF document text
    • https://andrejc.si/files/file/27113226111.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785419d166---63092648024.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/poramap.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/ketaf.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090719161191.pdfIn PDF document text
    • https://hiroyoung.com/data/files/fumojenodonabu.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/44093298059.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/25029553859.pdfIn PDF document text
    • http://meditopthailand.com/file/54573894650.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/7483278597.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/21711532954.pdfIn PDF document text
    • http://hydrem.ru/images/file/mejujobexiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tokyo+drift+full+movie+free+onlinePDF 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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 17076 bytes
SHA-256: 63f69b6d1273f2540692016592ed46f9947f45b7b5dfb3cde98a35ee3a8dc75c
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 10520 bytes
SHA-256: 4f2d137ca63c332493577d019886b7afc54438eed90ede7e43feffb5db47dca0

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