Malicious PDF — malware analysis report

Static analysis result for SHA-256 646349f96f310e52…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 08:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84f1a81deeeabcbf10263523edd6f07d SHA-1: 295b89539d9752dd2c9943344ffb1e4b8e43b407 SHA-256: 646349f96f310e5257030c43a0651a1f22d1185ce709805a32d6567fc6b93214
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=skyrim+bloated+man%27s+grotto+location PDF link annotation
    • http://petgears.com/app/webroot/files/file/49304574168.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/buwebixedasawesubivopum.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/58484859431.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/87238918373.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/rirevubimigazadibuwot.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/92268371504.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/81979418844.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/zipegejodo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/sesesik.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/52100606519.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xonetaturovewero.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/29615013250.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210920102146_pat0vh.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/2674480147.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/68993221786.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/29824209788.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/29267261738.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/koneruzuto.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/movizez.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xeredoguvutelupafuwanotaf.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rawevofuvuwavelugab.pdfIn PDF document text
    • 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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 11168 bytes
SHA-256: 4adac51e130a8fa0d27602b98fec0bbee2353e4d776a22bb0292a01728ac0f94
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 14672 bytes
SHA-256: 90d2df3c56cd8b74b93f9cd28b56a1588e4f8528554c012f37ae28e4d8abddc6
font_02_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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