Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0d73b230d2b5ef…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 16:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e73ab0fb8ce45562cf775d6cbd6fbe64 SHA-1: 0ef9558e8cd97e713be9cb292408d881a0bad9d2 SHA-256: af0d73b230d2b5ef0db52c962542552bfbc9f00891da909f5b631de4e5a84807
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://holcom-wd.holcom.vn/webroot/img/files/65315373570.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/kopabo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae72eb08c7---nijasesexakepefurenav.pdfIn PDF document text
    • https://techlan.pl/files/file/39665168205.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/36383243573.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/25995669134.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/26793768699.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/51824315561.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/67300853216.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/pavudobitapo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/budavapulapusenosofoli.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/67762383901.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ccsccslrd368eu753bf70p0mof/4898412070.pdfIn PDF document text
    • http://novichiha.ru/pic/file/momewavadekurojedeb.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///77960534574.pdfIn PDF document text
    • https://ijp2.com/contents/files/kujepola.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/gukemogid.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/natuvabijiwiw.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/4366578014.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nekaletugunozajafekus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lazarus+android+appPDF 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 10224 bytes
SHA-256: e3f057f5ad6c3e66cfd6db0a913b7af562e7bf2f129cf6884defebdfac866857
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 18056 bytes
SHA-256: 623f0641fc3022607428bdc81d8c496f250076ff1bcc0781f918b1c9afafb6b4
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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