Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7dea85553d2c46…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dd39aa67a1df991e23375a1513041fe SHA-1: 203d0e54ffb8f88544bd46e33570e58fee53dc0b SHA-256: ba7dea85553d2c465c7064f338f0222c5a58b69cda2f58162dffc477fd6488a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest 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 0.9965

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://crewmak.ru/uplcv?utm_term=icon+pack+miui PDF link annotation
    • http://tubelessons.net/cms_images/file/logem.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/kuwazakuweratuwufizag.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/reniwivanewubejarivadopet.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/tipitorejorelazodavawuge.pdfIn PDF document text
    • http://mextro.de/upload/files/20872835896.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/wujapotiwibowoboziwozizaj.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nutojejirexowuneru.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/xizemuze.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/17785929331.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/88534205862.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xutodesurilerebisuwodafav.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021092723055773499.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/52214978201.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/12596087703.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/doferoz.pdfIn PDF document text
    • http://domosplast.hu/files/file/xubewasajasezononus.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/31091427826.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99008160519.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xuvagedadesapiw.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/15063017072.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161425c31626fd---dujopedetefisedelebojuriw.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/59245549039.pdfIn PDF document text
    • http://hongdacable.com/d/files/luzominepijo.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/rusojeborifasokoletimuk.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/75449083774.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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 14952 bytes
SHA-256: 19e32aaaebba4fdcd16639191e0d2995f1e01dc7953c7d9d414d681f790a6629
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10136 bytes
SHA-256: e6f5b66d034a45aa1b6eb6946b159c69b8883c85a2bd2581c96a4f0ca44e8774
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1