Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54cc324e961df19…

MALICIOUS

PDF

76.4 KB Created: 2021-09-28 09:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f210eb8ac4cd004689d90eac401293be SHA-1: 1d9f4eed230945baaf9aa91ca98d56b3536c61d4 SHA-256: f54cc324e961df19a74adb4cadc23d7d2c4af7656ec45873cbaeed6a35e8a269
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. The PDF contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this conclusion.

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://infrive.ru/uplcv?utm_term=gba+roms+list
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/26102741797.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nonolujiwonasikeweriz.pdf
    • http://learnersdigest.org/userfiles/file/pabarolivumetimijabidul.pdf
    • https://yam-token.com/business_school/uploads/file/pezefivexupaveporogipubiw.pdf
    • https://glbtrader.com/userfiles/file/35176096095.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/18395682831.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/nanazigeviju.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72982221285.pdf
    • http://candemdientu.com/Images_upload/files/dusisibivezedelu.pdf
    • http://learnazia.com/fck/imagesfile/buzoxopopikilirewofela.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wunag.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9a5b3963bcf9f9df35c89076f020c84e/48901528901.pdf
    • http://abwninemile.com/uploads/files/21530522484.pdf
    • http://minerva-collection.net/files/files/fipuvojux.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/fijume.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444a48e74fc---lurefulawizevoke.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/41814247332.pdf
    • http://zespolbahamas.pl/zdjecia/file/lumalojejuropawibegazoso.pdf
    • https://hearing-outlet.com/uploads/files/202109011919021253.pdf
    • http://jfhconsultancy.nl/userfiles/files/92228798322.pdf
    • https://sharenkon.com/files/14444032546.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/64191944162.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 16792 bytes
font_01_sfnt_off0000d8be.bin
68ba308a54bd0899d7e8363ae57991225e521a9f8387b03689d12a2e53f9ec5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10212 bytes
font_02_sfnt_off0000efa6.bin
3b4920be590e621ed9d04c589d97615e151b130091b4c98ab67d50ad8ebddd1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 20104 bytes

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