Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57488a3d75d728b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 01ee418dfd0ebb3a40759dc667afb3a2 SHA-1: 03fe11912e444fb69a58ab2a434e55b86a0512be SHA-256: d57488a3d75d728b2a5f57fae54d4c142aa4f0a131bd6f5514658d0b452a39d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=deep+linking+android+stack+overflow PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc47bc3e59---74657818399.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65345888417.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/24707209261.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/49016080210.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d6a5b77c25b9308e1d61919f6bd53a9/rotas.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/vefagi.pdfIn PDF document text
    • https://hobbypet.cz/files/file/mobemojewazapikilorazef.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/34521181444.pdfIn PDF document text
    • http://temple.mo/userfiles/file/35761677679.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/60539133258.pdfIn PDF document text
    • http://sksound.com/userfiles/file/jurejeforu.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/xopagigenalod.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujolizoxabakewopil.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/nukipamozogosiziga.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/72250298793.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/23769550146.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xinap.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/73967329068.pdfIn PDF document text
    • http://viorina-deko.com/images/file/69081393844.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/ronodipupukakirip.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/92427343296.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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 11040 bytes
SHA-256: 189f737824eddf425a6d9ec7a357e27887ce64b92666d3ee0008cbd276649ddc
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 18860 bytes
SHA-256: 094826f99f597eb8573474cd5eb3f4e7d31ca732955afc2c326debf235f8ddd9
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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