Malicious PDF — malware analysis report

Static analysis result for SHA-256 82586cecf8e9efa2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-09 00:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4fa8d6b6b4ea89be477b193a2e06491 SHA-1: 8445783e59a46c2c6ebedff89142836c86db609c SHA-256: 82586cecf8e9efa27468758f69aeeafdc24bcfaf60c4ac057ec7c44ad3efc961
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting or suspicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV and the ML classifier also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=literal+and+figurative+language+worksheets+grade+7+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389080/normal_602643c7d2d7c.pdfIn PDF document text
    • https://lilexoben.weebly.com/uploads/1/3/5/3/135331811/megetisul.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/tufupurox_gasutim_fexalogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_6032a2b30e10f.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/open_source_flowchart_software_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5ff61df9cfd0c.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/sozukujuzilukekumigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff21a9e8f5de.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/kifuwa-xigafudaneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_601bcd460147c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_836f94a1ec32437e8f1cd12f457d6b88.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/domufi.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/data_communication_and_networking_ppt_free_download.pdfIn PDF document text
    • http://rolodumom.epizy.com/jufize.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_ac7563851cb04035b7c7de4e9dbcef37.pdf?index=trueIn PDF document text
    • http://pimorem.epizy.com/bolagakar.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_fbbb45778dff48f3a24e4e2dc8045e6c.pdf?index=trueIn PDF document text
    • http://bipedok.epizy.com/fetarerusov.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5424 bytes
SHA-256: d4563edc75b6931a4e16a839718b35ba613c217d3f7a9d2a5f40304ecb789fcf
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 10252 bytes
SHA-256: 8688b4dd7015133bbdc35c45489ebf20085d359b02108e5b3445c7ee931063c4
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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