Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18b54cca7f3f450…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 06:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59708b325b5b9e17cc116f86577df241 SHA-1: 9a881fa1d1c56165dec0d7ec11e8cb5d599e50f7 SHA-256: e18b54cca7f3f4500f167d84e813622e5c4b20689ea1363a5b8094cf4c639a30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The PDF structure and heuristic firings indicate it's designed to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yenicekentkaplicasi.com/userfiles/file/lagunurefe.pdf In PDF document text
    • http://pneusmarene.it/images/file/kofefilemu.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/15043762633.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/jatasodamupejaga.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/tinamugeliri.pdfIn PDF document text
    • http://secoinblock.com/upload/files/45028749727.pdfIn PDF document text
    • http://zenithmetals.com/files/60997663490.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/loo04tf9mpec5sm2uvoab5vnt0/loxasarusaluvuz.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wudaxutawavud.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/67177632266.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/55564642770.pdfIn PDF document text
    • http://df-2.de/images/daten/file/11926027744.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/64969732485.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/bozomemuxalolaz.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bisitalefudenekogava.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/65325159773.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/gasemasuvafobojusume.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/neperegemedogeravodeki.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/33949297388.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ce94647---34256313046.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/mojopelaxedapewiwerezakuf.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/83778267464.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/20165083422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fantastic+mr+fox+read+onlinePDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10716 bytes
SHA-256: 4fced6541b81d44d4a4ffe93443616dc32b0932fac7cdf7afbddba8fe0e38395
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 17816 bytes
SHA-256: c4d62c09f37f537909b7fee7a5f1e3baeedb18442f61600a4429abcb4520a12a
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1