Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe367c43aa51e2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 15:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0090e09c8d56ae67a6dedee7efdb0820 SHA-1: 517af8d64500d53ca7a8ec984350bb51c95d50a3 SHA-256: fffe367c43aa51e2e3569ea45ac1b84d7869038d684e0e71d70263a8be1e784f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bright-inter.com/file_media/file_image/file/sopodereresudabililetep.pdf In PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/marumizigigu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/56700618001.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/6518454939.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/kapevojewekavitosenir.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902091121_c2lnYWZ1bG9rb2t1.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/28738771652.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90634290402.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/rolibaz.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/juvujusixonogumod.pdfIn PDF document text
    • https://wrd13.com/force/file/75257409521.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/waganekawaxisof.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/ruvidowe.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/xetefitupiliguzubaxozom.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/bogufatenazudalobewitapo.pdfIn PDF document text
    • https://rinducm1.com/contents/files/bedajegidalune.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/90772541955.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/16787289247.pdfIn PDF document text
    • http://chemsdano.com/upload/files/vetemoxilimo.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/12123238988.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/92731930155.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tovanu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/13442f814762c0959531f91e33531b09/72829620575.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8e3a80---nukuwavenewolopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rick+and+morty+clone+rumblePDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 18336 bytes
SHA-256: a5c51ca8c61d783bb33b50d89432d2150852b8a52c40077aa043ada190d04f88
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 10856 bytes
SHA-256: 8fdc99994fd5af5bcbabab484c3510601a2bb273f9117968a6d300a64911d1c0

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