Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad2976d7413e77e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-24 17:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d620e789e54e306e77c900e9745f97e5 SHA-1: 1e8325cd047cc8c607e80e7bc40e26d50b7e720a SHA-256: 5ad2976d7413e77e7a61be72f3a0f067ab264ea5fe1277ad41aa84acfbdda0b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. These elements suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=born+to+race+2+fast+track+streaming+vf PDF link annotation
    • http://bernardthevenet.fr/ckfinder/userfiles/files/bezogel.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/somixebevitimegubofap.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/netekenedowolarilud.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/56561937514.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/61030365874.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/20820023568.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/goguzoxogodaponefuzox.pdfIn PDF document text
    • http://abwessex.com/uploads/files/jifapuratexologela.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/wuwilidemitatetu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88983e1d92e3119624fe7d8e079c1b28/51547881803.pdfIn PDF document text
    • http://happy-land.hu/editor_up/8633807512.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b30d81683f26169a988dcd138adf884a/50003381794.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/rapodaxudedaz.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/12144258746.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/62201482571.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xosusi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/newunukakafasolux.pdfIn PDF document text
    • http://handgun.ee/media/file/79449310336.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/41264688876.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/70009490530.pdfIn PDF document text
    • http://digifast.cz/userfiles/nizod.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_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 18800 bytes
SHA-256: ee700ed3589a8892dd91e47ce707d07ef38a81087abf262e4e410d99e9d47846
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 10964 bytes
SHA-256: 896c0df9462c027f6c3b4e1c706b0f725e541480d519ef90b5eea0a2840e8f99
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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