Malicious PDF — malware analysis report

Static analysis result for SHA-256 252e9a632dc11a50…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 22:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95cb40b639b33a5894ca01d30ff29673 SHA-1: 1ccad7099ef4351679727ca4bd3aa39cad797be3 SHA-256: 252e9a632dc11a50eeeba1dc96b7ca78821ba3304f248147bf0fa187ed950b35
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, suggesting it's designed to trick users into clicking a link. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of PDF_JS and PDF_IMAGE_LURE heuristics points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 69 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 http://zlzljc.com/uploadfile/file///2021090722313430.pdf In PDF document text
    • http://rc-mst.com/mst/_upload/files/26078570660.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fizofi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16971706649.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wafeloziwamakilirefufifaw.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210911_1CFB9706F7E69513.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/lotij.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0177a2ecc---1620105515.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gexudimujejepuvasup.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/94182215776.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/walatixaw.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/fofolajuxerutofobojuloduf.pdfIn PDF document text
    • http://faradbox.pl/files/file/15566415804.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79bd6bba4---74117505529.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/sobubadojes.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/vikesepisekemopegozo.pdfIn PDF document text
    • http://hoachattn.com/image/files/rizusesubowijupew.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83252149650.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/96513146445.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7ed3022731cdabb86345590b5e3682a5/64624290066.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/zuvekeredufejop.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090219015811.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/30514788838.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/dibixufopufesagegemub.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lagas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+fortnite+codes+ps4PDF 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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10460 bytes
SHA-256: 7a2268c0c2c5cb752cb7151d536508f9e4701bf02df4aa935184c1132c55bac8
font_02_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 13852 bytes
SHA-256: b12074f9a56db111fb065857941b02a390817635fd042d9c720594a7af6eb58b

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