Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a7e8cad0410fcf…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 20:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f26aa225bd8ef1a26d53c37565fd1f4 SHA-1: 04d2bfc15f3cf0796e95fe71e899c07bd679ac3b SHA-256: 33a7e8cad0410fcf99640524d86a8397712de27ec825e3835fd067d318f10153
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links. The PDF's structure and the presence of embedded URIs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=android+widget+size+1x1 PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/63859014700.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/webopozexaw.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/30886724712.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/71854712266.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a33c0ec---45652851221.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae283dfa4---70198637814.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/nomumuvozalefozupux.pdfIn PDF document text
    • http://vhshf.de/File/5538631768.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/5164602135.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lepanifuvisalimikesidubu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/78628067183.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/najoz.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/fodexe.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/besajaf.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/ravepukewimiwedoxinur.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/lexemobota.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/filibaxitetogotu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/jetumasusalun.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/virepudokenazakupifarulop.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/92374740845.pdfIn PDF document text
    • http://kelvista.lt/images/files/bubutemudukusefivif.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jubefut.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gapab.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_off0000c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 16864 bytes
SHA-256: a8e43ec51ae4b97301f1143a83dc181ca6dfd17c1fdc859d4dd31d69b94738cb
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10496 bytes
SHA-256: 2197716a7d13bb07b3c1eb0f1833fec23fafa9406b95ea874ecb78ab0b533b59

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