Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fd75a32a678d72…

MALICIOUS

PDF

82.0 KB Created: 2021-03-17 09:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 352dc8aa49f696ea90bc8a125302da1b SHA-1: 1a84087ff0e3e8bd37923cb172ea5e5e6ad321fe SHA-256: 35fd75a32a678d72562d9a72d06c486b1743b253e93fdc18df240508fa441cda
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. The embedded URL 'https://vilenefex.ru/strik?utm_term=how+to+get+skinny+legs+with+resistance+bands' is a primary indicator of this redirection attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+get+skinny+legs+with+resistance+bands PDF link annotation
    • https://cdn.sqhk.co/nokulebepoba/oUM0Fv5/51441246460.pdfIn PDF document text
    • https://monoxute.weebly.com/uploads/1/3/6/0/136051008/3d0673.pdfIn PDF document text
    • https://cdn.sqhk.co/tobizopowebo/Z2HghXH/renaissance_man_american_history_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_603715873bd58.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/tapomojaxo.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/4030121047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5ffcdc7b20c83.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/dicgcMY/wezuvesipopotomadugukuz.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/8b56341c.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/nuretubo.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/ijMjhid/38704252111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a877b353-d701-40ce-aa1d-d3043b49006d/what_to_do_when_walking_alone_at_night.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/aflac_claims_form.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_2a0deda3713348af9859cce9a38b2c06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0e1970-f4f3-4456-9224-c25c7cdf7bb5/gadupol.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_9066b1e51b79419ea5c8dcd316836c47.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_3637fb7d1bd44d498dd3649d9d18b08d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde4900d-9b9d-4322-b81b-e0f98ab1caa2/how_to_find_answers_in_google_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591d9af9-5cf8-4e02-896d-6fa6c36c6d84/62394290844.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 5560 bytes
SHA-256: ed5fe2ec14d95dec701013e143a68d3bbf312b538046094d018a7df240b51373
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10624 bytes
SHA-256: 01b2db8be37db67ac9b3d40c2fee1e32e820bdbde922b64367c1c1f073374f96

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