Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb5e3f70613f989…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 21:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380a23d29c5679dec9292f707c218c2e SHA-1: ba634898d5ed8eb73d6c6b0eb06a5f369a375721 SHA-256: 6fb5e3f70613f989295ab63ae1f982837791db4106fa62e1ab3748c0b22bb5eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The numerous external URIs, many pointing to disposable domains, suggest a link farm designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/74871790834.pdf
    • http://sobateracota.ro/mm/file/zopijapan.pdf
    • http://519pf.com/userfiles/files/vagejezenosimuk.pdf
    • https://pokereshop.cz/data/file/bapuni.pdf
    • https://maintogelonline.bet/contents/files/31138218414.pdf
    • http://bjdfszwy.com/filespath/files/20210906023137.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdf
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/tanema.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/22965215394.pdf
    • https://petandpuppies.com/userfiles/file/kejakinudawixakugobekat.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a03cc2c446bfebf8bc87e13f8caaf0bc/10508975833.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/kaxajib.pdf
    • http://bebelino.ru/userfiles/file/zokazoxi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dd40fa506b---zegojepivotenugofili.pdf
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/sepidupinomufopepamo.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/fipenizuxubomuninifi.pdf
    • http://www.donboscovizag.org/images/files/fodinunimumibub.pdf
    • http://swaminarayangm.org/userfiles/file/18362606091.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kefuwemapowopoko.pdf
    • http://coolscape.info/images/files/mulabewuwi.pdf
    • http://pnlestari.com/visitbali/image/files/tanowiweg.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/sugex.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/59130499951.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/80474294411.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+filme+pentru+android
    • 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_off0000dd66.bin
dc5279fd6d790176f678ff025a5bf49b3d5c5befd91c93991d308c38c5904d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10676 bytes
font_01_sfnt_off0000f5d1.bin
465c198a40eb616de6e593d46ccfcbf6406f35c89ee4a30aa997676bdf8ee10f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 18940 bytes
font_02_sfnt_off0001257f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16792 bytes

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