Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbeb82ee8612b535…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 23:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79dbdf1a542e4f80438851b15b6af734 SHA-1: cb828c1637466073de9d90f4d41f48014604f03b SHA-256: bbeb82ee8612b535e2d739d60648ec3e9317879dac85a11b1ba76d09bb68ca9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-based content, typical of a screenshot that hides a clickable link. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 75 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=upx+free+vpn+private+browser+fast+secure+web+proxy
    • http://www.morrisjones.co.uk/EditorImages/file/8210697290.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36139284255.pdf
    • http://schokoladenbrunnen.de/idata/95217466727.pdf
    • http://gelikonline.ru/content/Files/jolekavip.pdf
    • http://leeandrewdavison.com/download/58067829715.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/gefos.pdf
    • http://ladna.pl/user_images/file/vikopema.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/xoruzezumawexijojajuwola.pdf
    • http://coming-c.com/userfiles/file/16474194984.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/daliduwusiwatu.pdf
    • http://ldkxzzs.com/images/userfiles/file/musoxog.pdf
    • https://indiantalentjunction.com/milan/media/67766254498.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/wopuxuzid.pdf
    • https://andhimazhai.com/images/files/kurufaganovebuwamikon.pdf
    • https://mimpishio1.com/contents/files/dikit.pdf
    • https://annekienlen.fr/imagesfile/mafupenilubu.pdf
    • https://eownauto.com/uploadpic/files/60001960492.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/nivumunozavesod.pdf
    • https://lifeteacher.tw/uploads/files/202109051507068251.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/jemosometoxudud.pdf
    • http://ranchobg.com/img/file/94279831552.pdf
    • http://csc-0411.com/userfiles/file/20210909091248_ofnsm3.pdf
    • https://perfecthospitals.org/FCKeditor/file/85392981091.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b151.bin
6f7b06c002800ed40da43d109ca1d94263c574a85426395eddd5cc9044a5daf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 11044 bytes
font_01_sfnt_off0000cb13.bin
8eccd871532031316aaf18a76010b81d91cda74a2ab8a6d43d912039f88205dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 14176 bytes
font_02_sfnt_off0000ee24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
font_03_sfnt_off00010635.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16448 bytes

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