Malicious PDF — malware analysis report

Static analysis result for SHA-256 425a853f7bfce11a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 00:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e518253083b6d5d480b2672675743a2 SHA-1: d44d02a77af7952b487f29f0b80cc099b384ba1b SHA-256: 425a853f7bfce11a0159606e11dfcf3b55d1adbe625e5fc34671056ca00500c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to an exploitation attempt, possibly to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=mkv+support+player+for+android PDF link annotation
    • https://mimpi1pusat.com/contents/files/sojuvelorivikosifavoreral.pdfIn PDF document text
    • http://d-innovation.com/upload/files/pojelotosirolojirig.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/43717082174.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/lixirawipepoduwumavepeb.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/50461669704.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/6175150879.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/kojipagulawubo.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/gelimamupog.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/98375009730.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/b236u9enlvluped138r0f32l90/73376066984.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/netejafivovumo.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/barovavumawevuvobajux.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/rabebibumiwoduli.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jizikizonaxukuse.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb5c6409---tiduxenudodipoje.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kulifozakisusotebozaketip.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/36573264195.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/83426174254.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pegagugodapizazufofu.pdfIn PDF document text
    • http://levotst.com/uploads/files/70185757218.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/35171805435.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/22416183149.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/5109498004.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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16796 bytes
SHA-256: ec157cace0050d6b3bcf96253a0c078d46d1a5a285567a8204cb5f5e35b49e87
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 10856 bytes
SHA-256: e58af64aa3ea2b04c4a47813328c203fd68117fcc2059d928553ef82cb0d2eee