Malicious PDF — malware analysis report

Static analysis result for SHA-256 83408761af995083…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 13:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 687e728d410ffcaec901cdd5d0e421fc SHA-1: 656cf17eb2cf3afcfa1e2af37c19a98fd17a7077 SHA-256: 83408761af995083f326c7d1da259e29a45cb4dc7e8d1715a296023554c60ba3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=amplificador+de+instrumentacion+ad620+ganancia, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://pelibifir.ru/strik?utm_term=amplificador+de+instrumentacion+ad620+ganancia PDF link annotation
    • https://cdn.sqhk.co/nuduniguwufo/hchjfha/babozagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_6044654dc605c.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/baxuritaxuwene.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/lenepeduvij.pdfIn PDF document text
    • https://safejabev.weebly.com/uploads/1/3/0/7/130739713/7195426.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/YZGhjic/new_arabic_music_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_604bad92dc169.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/hAijSjh/jirunixenu.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/aighdhh/57712281775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5fc6c6e3157a3.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/jutobabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/backtrack_5_r3_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/small_engine_repair_textbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c3d986-a904-45b2-aef5-dd3f657e5dfd/dewalt_380mm_3600psi_pressure_washer_surface_cleaner_accessory_dxpaz36sc.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/82630307027.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/breaking_dawn_part_1_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/11843135496.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/bobipez.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/mojejobaposopuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce9a36a-c2f1-46d0-a040-0baf84d86227/lotus_sutra.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/nejidogefafatev.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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 5892 bytes
SHA-256: b36436df695b6a4290440d003f297c1c9d52dfa306e70aaf3f8fccd611802fd0
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 12524 bytes
SHA-256: a6f50284c67da355cf6e5a86de0f229497fe68ebf659cced8a6e3f8e2fdf4f5e

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