Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba4884efb91bc1…

MALICIOUS

PDF

85.5 KB Created: 2021-03-21 23:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 631b2a4b9aec99bd82008fab7e991455 SHA-1: b3e8a3bce9575d69dc1b72ed42be11b110601db8 SHA-256: 21ba4884efb91bc13986fa5432b4c6cdc5c1742e749f5eb7eed11222df5eb65a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

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://seumenha.ru/123?utm_term=dndbeyond+character+sheet+blank PDF link annotation
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/wegetitalu_pofakaxis_galevak_tinizefetif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5fe64b9be485a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5ffd258154398.pdfIn PDF document text
    • http://kumazekewenow.22web.org/greatest_salesman_in_the_world_scrolls_summary.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/towodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_602fff4ece269.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://uploads.strikinglycdn.com/files/c8c544d0-5590-4b7b-a3c6-65bc51ff9e0d/how_fast_does_daphnia_reproduce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c482a54-4d05-4d20-856f-cdbe2b6e5f52/how_to_find_area_and_perimeter_of_irregular_figures.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/dd_3rd_edition_monster_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/statistics_for_dummies_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/26623387700.pdfIn PDF document text
    • http://jolivawojo.rf.gd/51154082252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34fd878-9b35-44f2-952b-4141bc018922/harbor_breeze_remote_for_ceiling_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a39b806-a824-4507-b3b5-59cd24ae8a80/94070891076.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/mojibez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0c20e5-057c-4642-99e9-a410c0b2dfb2/what_is_16122_social_security_bonus.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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 5072 bytes
SHA-256: 44b557d25ddec4b190b8956103d65f230eb9e471d6e0cf2e9f6d9cf1e5f563fb
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 11504 bytes
SHA-256: fe74c9f3af29883413d49028c7cfe99f3ba2b2a2122b256cdcb6dc51ae96e4d6
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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