Malicious PDF — malware analysis report

Static analysis result for SHA-256 061beb99e9cf1111…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 22:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09b70e0faa347ad8d58a56e2350f9d94 SHA-1: db77147356c03ea160144fa41d5cc0187732beeb SHA-256: 061beb99e9cf1111acd5346303ec59ed25f4baa2d17d1b7d353c1c0c0135ba1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sjzhtchem.com/upload/files/kebiselimofaperibotepov.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/8779864184.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kanifilime.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/defewubuxegosivek.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/manipevetevixogisigupu.pdfIn PDF document text
    • http://mobiliteit.nu/files/10147890519.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/98347768718.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/3311287800.pdfIn PDF document text
    • http://snft.ro/media/file/venafajuji.pdfIn PDF document text
    • http://gnox.vn/upload/files/desikerafaketabup.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/lipusisomuxibelawiza.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/foxikes.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/bovakobemotur.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1077774721.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/tanafixegewedafupixe.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/sigoxun.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81988145557.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/nufigumevalodeleva.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/rotaxujixadu.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/zorosidogoniz.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/64276734136.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/senesunarowezojin.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/48296956800.pdfIn PDF document text
    • https://scalping.ir/data/files/file/63168022202.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/peligodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=recuperar+fotos+borradas+movil+android+sin+rootPDF 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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 19636 bytes
SHA-256: f337e3dc10fbdff91ae390df318cd1a1b708ddcec529b2d4601cd4921dce18fc
font_02_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 11132 bytes
SHA-256: f085ddb85948ed7f37dfb50b1e211f7f9561fd2801d0ac1b1bef103e8f24a8ac