Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae7268cdb140d17…

MALICIOUS

PDF

91.4 KB Created: 2021-10-08 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b59fdc7cf25c9f766f7a73d38ebb24d SHA-1: 796f0d4ec4b4e739f8701b0713bbaf172ce964a9 SHA-256: 7ae7268cdb140d170f10e13ed5a121318a517cdf761776bbc580261d8c72dc5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, potentially leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drakbera.com/ckeditor/ckfinder/userfiles/files/gusaz.pdf In PDF document text
    • http://phunphu.com/userfiles/file/2652178558.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/juwajovekanitumufa.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/bolumigovidujer.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zijitaxerowokalugigev.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/14608665943.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wobuwoziwajekabonoveruzi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/lagoluvadudawexako.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/xegezorapulixudodoluk.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/47847666840.pdfIn PDF document text
    • https://mahae.hu/files/files/kadusi.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/lasakewaxexubizokuberom.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/woxedebebubexodazekel.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/pufiporawojagonozezamasog.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0kt2a1t1l6dk2qlg7hktqrbt23/zemiminosanikafurezidaf.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/51137180631.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/12759531700.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wiloxejabudolutumuvun.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/retokijusarazu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/72766998280.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lajikipag.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/18022858155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=causes+of+impotencyPDF 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_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10740 bytes
SHA-256: 7db55f2bf6448a24fbcf7f4fc2c32340960f85031ba6fab02a08291ff7190675
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 18928 bytes
SHA-256: aad828ff4df500eabd81861396f6f9f2fcd4af93d0e3027ac325c55c17d35129

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