Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c401907f7abaf8f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 15:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a86e2e7b010dcfe209635d2e8bb98afe SHA-1: 34ef0951c07f78017b01ccdf1771eab04b5716e9 SHA-256: 6c401907f7abaf8fcd226e710e4e526d2deb6aa7cf117b89f5e21e2754019a51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to various domains, suggesting it acts as a link farm or redirection mechanism to deliver a malicious payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://prolocolidodisavio.org/ckfinder/userfiles/files/95809435499.pdf In PDF document text
    • http://madurastones.com/userfiles/file/vibabolara.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/28097797318.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9058c4f15---38639281939.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/reburijorunubesojagedumar.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nilalabevalirizo.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210905032300728252fopgum5dhg45.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65599191659.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bebakuke.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/37693389958.pdfIn PDF document text
    • http://kd-council.com/upfile/files/sixewoze.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/95827064051.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/72387636183.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109061908359648.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/5902226513.pdfIn PDF document text
    • http://naviway.su/upload/files/bibazoluwebixan.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/65970887789.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wozazakajim.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tevuwufuriruv.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/578279393.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/79088510270.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/61924790097.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/namiwifofudu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9eec076---75422151519.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+wc3+playersPDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 17852 bytes
SHA-256: 1b56472312c8e7e7dba2cdd3503761670412eccdcf072e4890b77ff803d5423f
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10476 bytes
SHA-256: 29205753bd83a71d2293463ebe460f06ec657649f778a64a1ea7d59aa4c361ba