Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9acd73d893a727…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 20:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cff9ecf1a2779564c5cfdff8cbcef21 SHA-1: ddb2738885c92660303e19297b41def2285fc2ba SHA-256: 7d9acd73d893a72742c222cbe1e3d705a08cf17a440de4ca0f50a06fda0d9e5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=wallpaper+ultra+hd+android PDF link annotation
    • http://reutlinger.pl/userfiles/file/54180506009.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/rumoduxo.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/zowuboxo.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/92100468602.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/61444194817.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/saxurifutazimisamemiw.pdfIn PDF document text
    • http://candientushinko.com/images/file/53420802070.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/xigalos.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138434901914---19876770669.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/48374261179.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/76782603515.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/20009911809.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gigulisojizurezebumagudun.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/towefemoketabag.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zumar.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/23970361173.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210924_8B2A27F185177C47.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/11019936473.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/33980109587.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/sujuruxagep.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/wulaveniniwutakudib.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/68506031634.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/42480863460.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/82739682857.pdfIn PDF document text
    • 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 10412 bytes
SHA-256: dfcd669de3101c3ee2aa8c0d9574282177a1fa3d403c6b7e897de8c7ff2db3e4
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 18256 bytes
SHA-256: 4554acd55661698e0df19da5b96a934cabc868a8efcecac9058ea8205ca3e464

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