Malicious PDF — malware analysis report

Static analysis result for SHA-256 a253b758a0925c0d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d12a7528b8ba3f44dc03d62bafe7e35 SHA-1: 2ee2a0585164b2acc1ff26b82aa8e7a1880bbd89 SHA-256: a253b758a0925c0dbc6d060d30ec019ac759c67b48ad49bdd2a14034262369e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://wingmanresearch.com/userfiles/files/29364931220.pdf In PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razonuzojorowom.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/36707666369.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/vatukasapobo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/98510561364.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/vimunuzu.pdfIn PDF document text
    • https://funke.be/data/file/13681604872.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nusubonefokopaf.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/fubogemejasujelitosov.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/85422479319.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/12711222098.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/kakafefozakoriluk.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/71895983901.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16143b80f0bd4d---zoxomut.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/bavot.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/tusidasijofijipogagosubes.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/81408067582.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c369e54c---40327512382.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/jotixir.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/miwabogipeseged.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/punadevutigifezuzefise.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/tusoronumipulamekafi.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/nijalexegoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=banjara+full+punjabi+movie+watch+online+filmywapPDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 17072 bytes
SHA-256: ce63d8c5546c1a373316780a1de6cdf7bf784d74283b0847b965d9b9562b4d70
font_01_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 11268 bytes
SHA-256: b20c7edfe81015507a46941a87167081d0d18bba6980ece2a541fe46f040070c
font_02_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1