Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756f8bbc47ae753…

MALICIOUS

PDF

69.4 KB Created: 2021-05-23 21:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 015d502be6dcb98a030d0d299e823a81 SHA-1: 6460adc54f427f78bf3815dba3be9a7dc1a979da SHA-256: d756f8bbc47ae75333e89c49ad470448a4a4ecf7f461533cc5397685897f8f01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://botokaw.ru/strik?utm_term=ordenar+frases+desordenadas+pdf', suggests a potential SEO manipulation or content distribution scheme. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a delivery mechanism for further malicious content or a phishing attempt.

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.
  • 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://botokaw.ru/strik?utm_term=ordenar+frases+desordenadas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452853/normal_600ab78cba54b.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/633957b800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_600db7d754c3b.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/1332835.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/820600507f7ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_606635a46f440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_603e2b2e2758b.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/6fbdbe516b7.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/8982995.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/luworizesupox/nujivono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ad31da-548b-4c91-87f3-deb744af1b30/engineering_vibration_4th_edition_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb12ed93-1ebd-4eb9-b101-a7f6c558a61f/how_to_change_ink_in_canon_mg5320_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/navugidakezekijufojos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab0d153-a458-4680-b84e-93271d3fc909/how_to_read_better_and_faster_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5fe0c2-5eec-415b-967e-5966499f5d3c/xipaposad.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bridal_chorus.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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 5032 bytes
SHA-256: 7a041378fa99d08ea01f56f6a3390b42af5a1f2833f86442ce8426959257b3d8
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 12436 bytes
SHA-256: ee21b99c8638a7485a7fcdb09f8b7d83a902cb34f53e1d3a2ddf16b6946c0179

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