Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ae332e98ad180…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a635cc25627c76cde08d9f2b2e14404 SHA-1: 737a43da86ed0ad8a833cdfceed503f47c302c31 SHA-256: d24ae332e98ad1801c292b98c1b26082f19dcce2dd4c1803c09890939a051417
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of linking to many external sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used as a lure, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://czerwoneiczarne.pl/files/file/42004258231.pdf In PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/migovamiruwabunulalobo.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/wowufazum.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/gumomemivijatedasis.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/40356703301.pdfIn PDF document text
    • http://119pump.net/d/files/lutinu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59a69ea56---68562110748.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/lamesu.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/99948494918.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/67409824556.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/70734796751.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a14cea327---28250238686.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/notorilonotuxa.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/niwanawowovegil.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/boloxaxolaxijuvenatada.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/93049774435.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903080452.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/vabun.pdfIn PDF document text
    • https://rubfila.in/files/file/xolamopefumi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/83871140345.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/kabawededopi.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/zidazoxerexazogule.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/vurunaraperazudugo.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nevinek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ping+for+android+apkPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10320 bytes
SHA-256: 6bcd5298dd6fe779fd0e2e09df9d550d13a4139578e46ab476633a5202b5d156
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 17768 bytes
SHA-256: bdffd5ea949614d1584cfa2494b0282e5e58bfde90ca3e806d00cc1e9a9c3cf2