Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd08a3ebae79a5c…

MALICIOUS

PDF

74.0 KB Created: 2021-10-09 08:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ad31853d49cb2e4f64d7c1b1eea48ee SHA-1: d24f68fbc13934bc63b896f34e084c116a26072f SHA-256: 1bd08a3ebae79a5c57ee438096f5cf8445b325b15593abea54f84e66f1bf2dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded URLs indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=lean+six+sigma+donna+summers+pdf PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc13f2f099---74252416259.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202110041827021797.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/dazifujozafudurapeji.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hlv7qq8mldjlf716mvp78o5kl8/tususabivu.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/99547476300.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/bamojesokutunevazazuro.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kovosunakuj.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210911_C9D0437B019E3539.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210919114933.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/budaxutevipukow.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/17372761321.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/vorim.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/29813010528.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/dukewejo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/jotujisibibibebipuruziwad.pdfIn PDF document text
    • https://moolans.com/uploads/files/83498320564.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wesufubezoxakadu.pdfIn PDF document text
    • http://infosierra.es/images/editor/76266428306.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/jamapoditijem.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fuwaxafokawifu.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/gunamurarajekovu.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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10856 bytes
SHA-256: 8e1c4b2de28f2c8e83b5c5089c75f91578cd446cb2290a3bc828986188e54547
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17380 bytes
SHA-256: 87021cb2a3cd646518af07a3eba8637d6757f8a8b66934174a9af7ff014d66b2

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