Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2667e721697a18…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 09:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 517785dc2381459daceaf422617d95bd SHA-1: c62f4f4ae7dee0d56e5f840ac03b47b0752c3a61 SHA-256: ed2667e721697a18c24aa4bdb9002dabac961f672f3744b81810d716edc94cdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, suggesting it functions as a lure to external sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in a link-farming or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://snailgame.ru/upload/files/20210913090325.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/momagafavabufopotafovazav.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/52478636061.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026c5a3b84---tonuxitakinag.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/66033185080.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/14381094967.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/midet.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/89923534880.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/winexalixipotineruzeger.pdfIn PDF document text
    • http://candientuvibra.com/images/file/79744783278.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/nuseforad.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/detibatalawux.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/84843379366.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/69581689530.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/78323014944.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/46316570974.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090423034586.pdfIn PDF document text
    • http://xfswchem.com/upload/files/31988157209.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_21_38_30_8625.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/govanujuzibukugam.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613638a2cef39---75714815251.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/81089513003.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/76686972246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+java+edition+free+in+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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 10444 bytes
SHA-256: 1d77cc7d8d46c918c610b5012ec8f8956ee26c9289808ba7af190d3cd609e4bc
font_02_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 16404 bytes
SHA-256: 03cb9d15798e9727ddcaed9e5aa17c882467baedfbaa9d9fc6bc025a06237e36

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