Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8418fd7792ce5f7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c986fa3ac45622dead8d9caf1367d7b SHA-1: 70d290bc7c8b2f4521b807108ee0b93de3e086a0 SHA-256: f8418fd7792ce5f79307635bd8109ef2bd0aefa98c8a3f6555ebac7c215454e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support this assessment. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://concurs-euclid.ro/upload/fck/99263108724.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/ravuvazun.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/91631437246.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipamaliwatanojawezap.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/damonajiruv.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/guburad.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/tazabo.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/12345460271.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/eb038ba433970bb9e1d0d3469c338be4.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/loxademudoni.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/3600102197.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/56531613750.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/fekulobibawemaxemorufekad.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908024659489231.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/nibosotetezax.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/koril.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/lebanakizitixit.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b142aeea51b26e35da6e835b0275cea4/23624308722.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28453888897.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/bojepizolu.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gudanowukapukuzon.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lurun.pdfIn PDF document text
    • http://tulga.ru/editor/files/92811067066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=periodic+table+pdf+2019+downloadPDF 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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 11132 bytes
SHA-256: a198f7704621e0e12068542fbca4899497e5539aef90f1f015524a3dbb8c9c24
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17136 bytes
SHA-256: fa1e10b49b8bce02321a28c6ccd2c1fa387257de8b87735c30d84fbc5eb334d3

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