Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b138495690de1c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 10:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee2cceefeee7d40ba81ff486bf2c700d SHA-1: 194250eabc87908c44ef5c57463b9cc821091bc1 SHA-256: f9b138495690de1c05951c91b663c5cec708b1d1809dec12b370a8c193644364
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to distribute or redirect to malicious content, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hebatkeren88.com/contents/files/titapobirudedafipo.pdf In PDF document text
    • https://daaeportrett.no/upload/file/kaxenevepimibozosepuj.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/podutosijamulunupalirunir.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/volomezitilujivewar.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0554d7dcc16bc5f734271f4bc890dfbb/zabevanogipati.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/radusokowepefirufirep.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/93252354454.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/15347868106.pdfIn PDF document text
    • http://matras-devison.com/upload/file/zojinuwitonebid.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/25830832220.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614887efedec0---28087798096.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/73519370349.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/20076766206.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/fepanakibevixa.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/xorepi.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/8292710343.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27204987319.pdfIn PDF document text
    • http://imbirimbir.ru/files/54602487799.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/nufagofulidaw.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jaxudizadunetidena.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vewemijukodajaxizixedeluk.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nageverakod.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/88825655779.pdfIn PDF document text
    • http://savemaxint.com/files/file/dewupibisef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=freeflix+iptv+apkPDF 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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 15340 bytes
SHA-256: c20b48c3822ab748ca65304d4ac9aebc88c3ab9be66840f554e5ab4d36d4596b
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 10196 bytes
SHA-256: eae966c11a503278263714959285fd1f70c34abe69cbd9d3dbdab5a5f49658c1