Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bbed6e8547b198…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 01:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 043806a12e5f3721ac58e6ad14deed77 SHA-1: 1a61392e4bb88d03bb28cca190dd40f57cb8e113 SHA-256: f9bbed6e8547b198421639243fd7bef963505849c7cf21bd48b7301b8fc3b661
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of external URIs and the nature of the URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://miyozenemeryville.com/uploads/files/sobani.pdf In PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/26001009705.pdfIn PDF document text
    • https://spyboarcams.com/files/81705957771.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/resexetopapiteferevokif.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/3048240894.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/vunogejipizojazuwotalela.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/11511198482.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ad0b3137901ca541471e9788e91b9ebc/39317648902.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/wisavegimutisavuta.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/gijumebapazot.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/50015557122.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/10613188083.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/96463997264.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/sumowobenubazudu.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/44408587819.pdfIn PDF document text
    • http://health-bridge.in/upload/file/80977463412.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7bijdud1t93pn0jal1u49nadjs/61014720655.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/wagonulokab.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/rodotasafiwuf.pdfIn PDF document text
    • https://zagi.hr/files/15252934325.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gepalejuvubonem.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/kometifebekoluxaxoruge.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/36325214418.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/85654532201.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gogaxamogowuledefalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=javascript+coding+questions+and+answers+pdfPDF 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 16156 bytes
SHA-256: b91e7163a0b315159c7f7e543f1d3db350d9884aa624a72401b89517ff421aae
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 11140 bytes
SHA-256: 06c8fcd79b445915f191ecbaca827273ff7684139f7562cdc061e58b6aa2fff1
font_02_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1