Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b263da36f99420…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 04:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f2e2901a4854da68a4347a7f4fce829 SHA-1: 520d849f60de3bb2eb511f69cc401c4e437a5151 SHA-256: c8b263da36f99420860223d04bb26da55e7ed9f48c558509e592894635f2be37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'SE_QR_LURE' further suggests a phishing attempt by instructing users to scan a QR code, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=how+to+scan+qr+code+in+picture+iphone
    • http://elektrostroy.kz/ckfinder/userfiles/files/zadilururut.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/danenudumapalulananula.pdf
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdf
    • https://canionglobal.com/FCKeditor/file/5553015395.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/gasolenorapufixafisad.pdf
    • http://americasbestmanassas.com/uploads/files/32603445919.pdf
    • http://abwva.com/uploads/files/feberunukafevidiresi.pdf
    • http://ty6600.com/userfiles/file/23953738275.pdf
    • https://ibshospitals.com/userfiles/file/73611425066.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rozoruxowufekezosibaber.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/v7h29kv3hhs2jt3qv282oqmaej/fogenewukotuxa.pdf
    • https://sooryasales.com/uploads/file/79766008595.pdf
    • https://jjcfurnituremaker.com/userfiles/files/86284250266.pdf
    • http://bycongroup.com/UserFiles/file/losililamusud.pdf
    • https://il-gusto.com/images/file/20446881216.pdf
    • http://generale-bureautique.fr/gdb/files/file/78819233451.pdf
    • http://fra2ange.it/userfiles/files/36673213267.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3fb07b8---negusudepasipawisulutexif.pdf
    • https://073741256.com/uploads/files/202109121442442321.pdf
    • http://energy-labels.com/userfiles/file/folexotimot.pdf
    • http://restaurant-lyons.fr/userfiles/file/piluvojolugejuvine.pdf
    • http://thuonghieutoancau.vn/uploads/files/gasexikuzulevim.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_off0000d9ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
font_01_sfnt_off0000f1e0.bin
2c4ce1d7bc68bb0ba9faabd8b05b8d7588a238b4ba61b2eef0a65d7108e6f207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 18064 bytes
font_02_sfnt_off00012089.bin
cde68d3812eec26d2cb6c25f31f5bc5c62885ba79cb26c694747e9414f2efb93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10888 bytes

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