Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fe5b09634d44a5…

MALICIOUS

PDF

84.8 KB Created: 2021-04-01 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7e8badbefb4e0ab7936b6640578ef999 SHA-1: d08a8f2b54fe912ae5a35bc93552f3248531ca8e SHA-256: 66fe5b09634d44a5f1bc727fa6a9d08c72f252f23c7a3d86d38ac2f2c9e0270f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to direct users to these external sites, potentially for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/award?keyword=exercises+for+upper+back+pain+pdf PDF link annotation
    • http://xikizolux.22web.org/character_analysis_worksheet_the_crucible.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/55254927139.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/2907169.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/9501184.pdfIn PDF document text
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/mabavatimimizaneviru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekubone.epizy.com/33596031474.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_d05c122a129e45a893baf601f8767bb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2030438e-0b89-4391-bdd9-9d068324115b/.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/construction_company_responsive_website_template_free.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/xilabedesidemera.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_fb6f517b8e0a4640bd6be0877ac5a812.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_7849a2c8375041c0855fcbcb36ad1032.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_0d0b7d63838a4d9086731b125de72090.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41900364-1c35-478d-b07d-9bfee180b455/67484647588.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_3dd8c4b6d4e34f2ba454fba9557267c7.pdf?index=trueIn PDF document text
    • http://vuxawov.rf.gd/galaxy_grand_prime_pro_full_specification.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_5f23cd52b2354db188656e2c0b84ee3f.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_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 5348 bytes
SHA-256: 73813b0164eee8dd88ebff7881335f25595e1afbc6fbd6a16d77567e31384cef
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 13244 bytes
SHA-256: d1641efdf0f8208716f0c921db57da71ee10a503bc768ffad435ae19c2ab4093

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