Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8436e91e85f3368…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 20:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 910c1cb1742c414dba1352cef4209610 SHA-1: 5f11c920179a9c6979e034427088b5465e005fdf SHA-256: a8436e91e85f33684c47eeb3c541963214afe215bf4fbcba197b03a096c2db38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing attacks. While no scripts were directly extracted, the nature of the link farm and the embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://qianxi.cn/filespath/files/20210903102846.pdf In PDF document text
    • http://mlsy.cz/images/file/files/21770964697.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/86844276213.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/14749186673.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wogox.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/sevabizenato.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/40190992732.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/migekawiz.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/79554232645.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb46105---jekowidepudimuba.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62816947219.pdfIn PDF document text
    • http://czminghe.com/upload/files/watumeretadore.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/46332200586.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wupul.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4cd52cc2---bofuwiloxame.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/081436183496.pdfIn PDF document text
    • http://vlajamo.cz/images/file/bopujojakoganamawekuret.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/81924647684.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rewusafekagi.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/20290845379.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dalaxas.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/99081173263.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/midonigob.pdfIn PDF document text
    • http://twilaw.com/files/files/nifawokufob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aplikasi+browser+tercepat+di+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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10808 bytes
SHA-256: c70fd731d878f042d25dfbd4150fd1e976ad6aa0e25bf1cfee019cd10cb4e17a
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 16604 bytes
SHA-256: d82f278dcc74100e18d0ed5141f9783de43896e351f3f07538861b7195e76ff0

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