Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e35ff118149e179…

MALICIOUS

PDF

102.2 KB Created: 2021-03-26 09:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9418f949ac42229ee081d584efccc93a SHA-1: 7664433a54f7ea0044d29785b4778c4acad809d2 SHA-256: 4e35ff118149e179d317f968c9ed1eed31c48f37ac39eba69c98f8dc6fb14c4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS and ClamAV detections strongly indicate malicious intent. The primary malicious URL identified is https://resalured.ru/123?utm_term=cognitive+behavioural+therapy+worksheets+pdf, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=cognitive+behavioural+therapy+worksheets+pdf
    • https://cdn-cms.f-static.net/uploads/4505837/normal_5fdc6ec66cb55.pdf
    • https://cdn.sqhk.co/kosadara/nqGicjc/kijotuwekorinuxekager.pdf
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/7c765179.pdf
    • http://cardio-natural.info/non-verbal_reasoning_practice_test_2yjj5b.pdf
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/pekuzase.pdf
    • http://reawont.online/23320590847n24cy.pdf
    • https://cdn.sqhk.co/surixirulol/jfje8jb/mercs_of_boom_review.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4501993/normal_60310b929f082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_f2aafb71b3484a13b926430c22ccb95d.pdf?index=true
    • https://s3.amazonaws.com/wolina/critical_thinking_skills_formative_assessment.pdf
    • https://s3.amazonaws.com/loneminovu/angular_class_style_guide.pdf
    • https://s3.amazonaws.com/satedafadusizo/minuet_in_g_major_sheet_music.pdf
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_777b44dcf89c49319bb5be39bc7a9009.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_7404aca6ec2e4f21a356ade2296cef47.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_361d8eb8e85448a4b536dc03449da87c.pdf?index=true
    • https://s3.amazonaws.com/pibabopuduj/48783044569.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_e8e39e6671f5452da62bd5f3a69b06c3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015024.bin
1d9e73c338f1f1b0294a56a153bdec6efb6834c89147af258ce4e634b555ca3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 5664 bytes
font_01_sfnt_off0001637a.bin
011d147ebab27f1d07e368f5ce43397a74548fb4d59ed88d8a093108901eafb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1637A 11308 bytes

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