Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0031805fc27c7c…

MALICIOUS

PDF

81.6 KB Created: 2021-04-24 17:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d1549346e4515f0e6e3eba071611d095 SHA-1: 54cd6949e083a6cb096e8b488d86d54974d41c86 SHA-256: 4b0031805fc27c7cf68aaa5c05a9aa8b93b7257905c01893d2a923e4047250b0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://crophysi.ru/strik?utm_term=introduction+to+law+for+paralegals+7th+edition PDF link annotation
    • http://axecheat5.xyz/how_to_get_alliance_teleport_guns_of_glorya2wqj.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/fB3gfgf/48728613241.pdfIn PDF document text
    • http://bionatur.space/sample_lab_report_introduction_chemistry4matj.pdfIn PDF document text
    • http://mmamba.ru/mogitiwivajakoxgvhzu.pdfIn PDF document text
    • http://verifybadgesbusiness.com/69224099848lk36.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/faL9zYP/cut_rope_game_2.pdfIn PDF document text
    • http://wowit.pro/dabbe_filmi_indirdjr5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_605549370c6b8.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/ehMjjpj/banjara_video_bhajan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6037b8fb6f258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b78ab2e520734cc0bd88cf9bbfcc2986.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_203533d8fd9145f68d6750a1bf0076a1.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_f7591077e71747049d70bb07b7583f6b.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_fd03e1f3bf8049018feec991593e1378.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_44bb9ab0af734a5e9496bb5d83107bc0.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_9f83ae85ea634be48943a9ef3d9e376f.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_c7448a7dc22d4e5f9b176460a90da921.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_5a6ee6b59623481c85fa51eab374117c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 5528 bytes
SHA-256: fa4bf48b2f28debae99b5ddee8eaebd7982399ae1297e34d459a1a6053359118
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 11376 bytes
SHA-256: a4c05edf271d9b9e5d412fd9be71b5507b42690e2b2285449964b6239cae7aea

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