Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e0bc57d782dd6d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 00:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4fab6c49464516c325568ef1cdfb75cf SHA-1: a85806d01474526177fdf685b1a5bba6b11183f8 SHA-256: 43e0bc57d782dd6d039ecdd7a853155603f849623ede57d8ec78ec6d840ff2de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is identified as potentially disposable. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://autopsrus.com/ckfinder/userfiles/files/69766120365.pdf In PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/basajumibipupozotegokule.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/80764868446.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/xibevadotazanifogowif.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/43706491176.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2c649c67---rejaguwuridata.pdfIn PDF document text
    • http://thegioioto.store/upload/files/85810822031.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/15680050338.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/32037070815.pdfIn PDF document text
    • https://actorconseil.com/files/file/vojedilinolaruwaba.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/43999707335.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/64138330623.pdfIn PDF document text
    • http://innotack.com/userfiles/files/868044285.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jumekoguxiwuv.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/senomewokanorixonap.pdfIn PDF document text
    • http://podarox.ru/public/files/riliro.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/lejoxigokuwo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/59793589348.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3de32a2a078ae827ce2c5adb037f20e/jadoveriwovenuratamo.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/vosufozog.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/48454050757.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/dinopunakoravalega.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/97127368315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+delta+india+lima+foxtrot+stand+forPDF 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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 19016 bytes
SHA-256: ac0179689500354ef3db46222b9f7ac1c5fedd86f432caf5bf2b4532fb306f32
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10712 bytes
SHA-256: 95056156532bae587f845609811f7418921b15811dbd25cd53f6a228f77e28f9
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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