Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0a64ed40075086…

MALICIOUS

PDF

79.2 KB Created: 2021-04-22 00:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 73b6dbfc504737c4cde57ba34051003d SHA-1: b0e511b8874171946aea89ed9f6f45933c676a3f SHA-256: cd0a64ed4007508646d3286b9d900ac28e258c75cfa1c1a1b3f904478bfe237e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=the+art+of+racing+in+the+rain+movie+quotes PDF link annotation
    • http://rigizaba.iblogger.org/full_size_platform_bed_with_tufted_headboard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6055ae592f29f.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/what_is_liberal_democracy.pdfIn PDF document text
    • https://cdn.sqhk.co/nijodujex/ehbTehf/lovecraft_country_season_1_episode_2_review.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_603b7ad8f3b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_605c7069ed3ce.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/7hiecgd/zojuxuvapatimosov.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/e0jfhfd/16229639679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_604fd68d3f8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6019d97a5e66b.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/wjhwq6I/group_kpop_paling_popular_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/gxljchh/78999137862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60212d34dbfa4.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/4jd2ia1/59870114119.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/ggczigg/daytona_usa_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/aiiiIhc/nevukixalodipikosonusarik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_602e3c5a673d5.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
    • http://kivutivepew.rf.gd/logical_intelligence.pdfIn PDF document text
    • http://raxibiwuviz.rf.gd/bruchrechnung_addition.pdfIn PDF document text
    • http://vudujufilax.epizy.com/1959796511.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/zanaf.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5280 bytes
SHA-256: 0b7094c99e62e9515e393fda29979a763bc67debb06b94c898e1a616d89d11b4
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10508 bytes
SHA-256: 4c457575e8fc9adcbfd73cc92b71c03d6ac15843ded99ccb4b34237f8cbd3684
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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