Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b351a38899a339…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d8b1606cfd380dafe96bf04c1e6b03a SHA-1: 56a0aeacea035703591dc93905761a2ffaf7fa14 SHA-256: 59b351a38899a3391834baa9a9478958fa9d150e5ab5b0c7f7b8aafdcffc69c9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, with one link pointing to a suspicious domain that hosts a PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ku4ysk-9lgp4y.com/contents/files/52739986296.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f0uhuud51cgt5b6gd4g4psuac6/lamifojavuwexosaxepama.pdfIn PDF document text
    • http://tion.hu/upload/file/pomowujuvomi.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/93932750438.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bozevudutedagar.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/21703330288.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/virosuxive.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bimirapumiduwubamoza.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/44273030865.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/38149825968.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fiterunijenu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/jiwubugoz.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mevomejuvufevewijerab.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nikewirider.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/vamibokowa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5cf982614f91f75486f86c01fdabcd99/xewuxakuxodajele.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/35977859606.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/toxenumudituxonuf.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/kisafesimaxaleveza.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/tiparewidonunotinov.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/pofarido.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/jaletosajone.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/87851790921.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/fugujovuzafofikojozuxuna.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jonona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=samsung+galaxy+grand+prime+mobile+detailsPDF 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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 11268 bytes
SHA-256: dc3fd44c8b8633829a6eaeff6ee37aad58def92a7058000caf795fe1dd2efd07
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 17208 bytes
SHA-256: 914b96e2757c03320095f4c734be1923746c41a60d9781aed5157285e29ef52b

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