Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50cd200c1b54488…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 01:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 058e841332e00e67707cffcc2a1082e6 SHA-1: 8addf01b13c4f7c70982736faf1a5ad54445428b SHA-256: f50cd200c1b544889bf95bb6be2276d9ad52affb2d3337f9ef6575cab8667b7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=android+cinema+box PDF link annotation
    • http://hide-bo.com/img/tmp/file/xukikulemuzafojojomulude.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/79848261474.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/sifujaxawulokigo.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bofupewazaxevolabibizek.pdfIn PDF document text
    • https://rubfila.in/files/file/pafenonojikem.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kefagil.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fubirifakepanarawuze.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161367750e1423---nasixusadawesulirexo.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/toxuvajava.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/lipubakusu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/24132466365.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41060d3be626fa261370c9fbc1c6183a/purojefitivuxajudated.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/43837055195.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xitaveroxipexetu.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/rafamomataguxigevoraba.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/todexidazoz.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/tomexemekaxabuberum.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wulefewiwogiwi.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/lafeleluw.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/lagujodojibakunujurewo.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/33742715396.pdfIn PDF document text
    • http://rsentco.com/upload/file/bopugazilu.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/mupidenu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/rebadobixad.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_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 10444 bytes
SHA-256: a76df8c235e02ee43ca08c0a92fd0124d92bc6d8ade2dd27566922b7b1d06eaa
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 18344 bytes
SHA-256: d54d15f8813ee44615482cee72dd1a756ff0fcbdae1f0ecf9df23acfce9af03f
font_02_sfnt_off00012ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1