Malicious PDF — malware analysis report

Static analysis result for SHA-256 87694addb145c30f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 12:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e240fcb3e7a784d49459ed434bec4bf3 SHA-1: 844cea20225a7b5501bfffb186b72ba27a894e4e SHA-256: 87694addb145c30fecd969b73d8a0b3afa9506bf3c70cdee274ce174c94ce0ab
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. Heuristics strongly suggest a lure for browser extension installation or MFA harvesting, consistent with credential phishing or malware delivery. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=how+to+share+contacts+android+to+iphone PDF link annotation
    • https://ferest.ro/imagini_ws/faroxujakodaraxurejawes.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jonona.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/12990649826.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/totuxomitajedoziselifuda.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/fukugawexodexumaxekejifip.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451580ea733---kisazokavedudukalodiwebuw.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/13669231452.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/luteg.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/botubeka.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/59008030570.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52315134953.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lufatixusanatizebosi.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/74263588912.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/mifabagositowifuvogudux.pdfIn PDF document text
    • https://atrax.hr/files/89033706243.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/jumijizidisaladenoximiged.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/10018987077.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/wozovoxujujoluvalaxite.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/batupixoto.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/23741721345.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/57050048129.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cac33a70bdf36b403d4ca1616c5ce9ce/75147292785.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/mugofezuvewuposuzek.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/18459371064.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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16916 bytes
SHA-256: b7adcbc734506c66d28ec4c17e248ca6ae31cdbbcc01a6859feecc19706b7071
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 10644 bytes
SHA-256: 1f1f75f960dfae2bea3edd1a54dea8d34e8a54d4ea76ff8c3275f0cf802b2e5b
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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