Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a99296066d57584…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 17:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae23aafc1a87e50f73a8b246a237f66e SHA-1: 591d2b0d242ffadcc25c724ebb7aa28d8ecb0f01 SHA-256: 2a99296066d575840e0af65ce93fe44f5de026b04a9217c1d25c9d0f8a966198
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://whdhgs.com/uploads/file/20210910185228787.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e61sg7mqo561qsq6s5ohu5l1pd/78411944439.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/54749076841.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/motexu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61e4c312d---85025503296.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/60054961894.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/88667799982.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/bupozadafuxafogivugixeb.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nomakepefipo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/64118435523.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109220955018780.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/najemimoxa.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/mofopogopupanajiv.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/tetoxomufalavifafa.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/84060864559.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/17869515413.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/togoputakofuparefivasaj.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/jimoro.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/meganurujijorunewi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tedivipasowe.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/3596584349.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/vigomo.pdfIn PDF document text
    • https://ef.msfoody.com/upload/files/88346787368.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/lexebemasosuzojuvizevim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+csr+racing+2+mod+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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 10928 bytes
SHA-256: 2302fe5c5fd25c69e6baa6339274d54ab78e42e72d3d2c84d2afe546cd78ec71
font_01_sfnt_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 18432 bytes
SHA-256: 1aeb8dee0275f6366d361fc20bfc86ebb09a67f399bacbd5099cfcd446bdd852
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1