Malicious PDF — malware analysis report

Static analysis result for SHA-256 4795a563504ee6d7…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70d023187e4c84dd2db65f979426e82e SHA-1: 7f3484511096298f9ef8c0725f0fbb4da0e6f998 SHA-256: 4795a563504ee6d776b775355784596adee1f6de276f1bc036538e139509e9ab
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect the user or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=50+shades+of+gray+3+full+movie+link PDF link annotation
    • http://archi1919.com/smlclub-files/file/nakepefim.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/85775411479.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/14494184629.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nuwanewunuwixadusipipe.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32071548731.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/96138592585.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/44275849578.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/15924128909.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/pedipifadexuko.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77973287755.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/metos.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/vazunifurez.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210907185804.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/86695287739.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/3160658844.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6a892b6---76527471611.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/tarasudawebugajemitud.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/23692767222.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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 19364 bytes
SHA-256: 24959679a6ae601924e62fa1c4affcee11f28d601b8becac3eeac045aa629c5a
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 11408 bytes
SHA-256: 85f9a0ab537512171e1aec0299e4e3f5c4cb39c5e44c320520518cd716e0e37a
font_02_sfnt_off00013d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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