Malicious PDF — malware analysis report

Static analysis result for SHA-256 26539c93cb63d647…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 17:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3731e64cd170ee454b46afe316a03f6 SHA-1: d2f239ffdd507f081797aa7ac00678d96a9b5f6e SHA-256: 26539c93cb63d647aa33f963bb12b2f432b5ab790b0257ee1ebe1ee918a3a20c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which are flagged as unknown or suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious activity. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gbp.dropship-online.com/userfiles/files/92107873029.pdf In PDF document text
    • http://octapus.vn/images/uploads/files/30640572123.pdfIn PDF document text
    • https://tadimtursu.com/image/files/voluvokewitozuso.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/jimovagigi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/23227899361.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/25994140028.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2c8601404ff08589e5cc424168598641/64776952808.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912230334743128jrjgw.pdfIn PDF document text
    • https://istanajp.com/contents/files/11912500843.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sititazifivipumudodevig.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/susepuvefedo.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/fozaveliwom.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xadijirawujakogot.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/5130823164.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e9a4da1---81415900157.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/38589628214.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_C58FC9E33549789C.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/dbdb682f6b450cb57b798f3379b6d476.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/dodivok.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xolutelazi.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/23987267350.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/40222269768.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210911_553FBF96432117F5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+7z+files+on+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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 10792 bytes
SHA-256: ee5d36d66ea84e717a87ae90bfd172e3b28056687f3993210a3e0aa8c73dd086
font_01_sfnt_off0000cb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB72 15692 bytes
SHA-256: 8ff7e964e11a59f3c45effd04504757023e2ba70bd3dc9d65ff0d8fea2820f0a
font_02_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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