Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d28b1748f5ad02…

MALICIOUS

PDF

90.2 KB Created: 2021-09-22 11:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da646486edaffbf5f26a6fa3bd2e4ed3 SHA-1: aa3da81d782ea30ba45f611746a589bffacf76c8 SHA-256: f0d28b1748f5ad024039a79d71e4e8630b62d044b4cbe98663fb8481237bd3c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=thop+tv+android+phone PDF link annotation
    • http://48bulls.com/js/upload/files/zoteketiriwom.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/vifofufajamezinofujimave.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezofijefibubokowazul.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/vewezivukani.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/43557250612.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/92208783955.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/84011628461.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090502561714442.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419fc0a3a45---15861542046.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/tizavona.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109020550094583.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/losubesukividulesomid.pdfIn PDF document text
    • http://df-2.de/images/daten/file/88301483864.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/98214497041.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/74482193947.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc998364fe---nowosaxu.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/54979422230.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/mokik.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/94967098700.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/ruzaxowerurewe.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_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10304 bytes
SHA-256: 81690d2b0a18d2966a635ecb92ac2c81b7cfa38ac56b221e2ecf2f4476926ee4
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 18056 bytes
SHA-256: b5ba4da6f2cc6f020e4df1328f305f3dcab84a1e8b0667b22fb116dfd3f3eb93
font_02_sfnt_off00014422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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