Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab6360f6d04cb7d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 11:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9482e8a84e08473a01dd6da98bf91c2c SHA-1: e818812e44bca30c374b7d2c55489c0b283ed0ed SHA-256: 6ab6360f6d04cb7de864a07a78763a5b21f649d6169fac34076de1331f983c2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://satellietgroep.nl/userfiles/files/wovowasepopufiminapigewa.pdf In PDF document text
    • https://absoluteanytime.com/media_file/files/files/76757638397.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xufujinizafizofexodi.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/97340899326.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/8525477766.pdfIn PDF document text
    • http://chameleoncoupons.com/adgprocessing/uploads/files/44375873599.pdfIn PDF document text
    • https://ms01bet.com/contents/files/fomapasimupogo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/35980657559.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/nowagilo.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/78975059276.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/28776918687.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/zisonikagenufebatuda.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/gexos.pdfIn PDF document text
    • http://asid.rw/userfiles/file/futerumedunazuboxuroli.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/97136193592.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/35816562085.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/vatigewuv.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/11871159206.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/95602846319.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e12689687---xuligusuxuxumulanomipu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/wetosozetopidusugexozeted.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398c3e868---vinizegolif.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/83677154092.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sovenunakaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hotstar+download+androidPDF 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10184 bytes
SHA-256: d39951dea0814a38721a9275e7349b267960c359120413656224ddef8f5c84d4
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 18296 bytes
SHA-256: 586a45bf0cc5f3406076a3472e299140d238be1ae96a7cc72c5d98a1a0f5cd5c