Malicious PDF — malware analysis report

Static analysis result for SHA-256 c978d44bacb81cf0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 08:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2dac2c62509add05068be95fd6cd9bb SHA-1: 9c7f1ca28fcfd6c0b8c6d0ffc4cdd72e43642000 SHA-256: c978d44bacb81cf041074fbae548e74565db8d0f0d4b4d0d108a519eaafca144
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=free+sex+games+for+android+phone PDF link annotation
    • http://cuacuonductudong.com/upload/files/41663686594.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161358d447fa34---wawonilowujozuvuzike.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/24840672150.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/vebipulogebekopi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488316a43d---sisunevibageduw.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/23735973168.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/8188963940.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/givipusamifazav.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/73203366823.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/70213844625.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/35459518345.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pavemesodujuzixinakidome.pdfIn PDF document text
    • http://ihdbd.org/upload/files/86085801059.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/dexazasixazewogosa.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/65067599352.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pedamazofojujazaboxa.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/mapidezisozo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/41323944134.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/maxejosenisiropivab.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/75190580322.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevemakoguxome.pdfIn PDF document text
    • http://actinq.nl/upload/file/34258751118.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109021812109706.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/solavoremanunom.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 10880 bytes
SHA-256: c2687fe081f69fc34c7f02bcc43195ca7ec0f1bfc37c1a3570d90f40efd6e2ec
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 18116 bytes
SHA-256: 58be4e89a850bd77abd98ebce483d8586dd0bc553b15ba0297d98c326c7c0d72
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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