Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7516c86bf56cf5…

MALICIOUS

PDF

79.1 KB Created: 2021-04-28 11:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 383227fffa603dcfe51678641d37189c SHA-1: b0c68236e21f5e6ea15384efbacf8ee09b290466 SHA-256: 9f7516c86bf56cf566bfba222f1a385f6e49e98ad4803dd49b99445e7281c425
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('pelibifir.ru') that is likely used for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=a+court+of+thorns+and+roses+book+1+summary
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/7a6bc963e19.pdf
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6024a1324d930.pdf
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/rekojiw.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6023cefe560ff.pdf
    • https://cdn-cms.f-static.net/uploads/4467274/normal_60278cbcf0c9d.pdf
    • https://cdn-cms.f-static.net/uploads/4475725/normal_6032f8061f55c.pdf
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/6921580.pdf
    • https://cdn-cms.f-static.net/uploads/4416672/normal_605f8bbb31423.pdf
    • https://cdn-cms.f-static.net/uploads/4498971/normal_5fdb9800a70fb.pdf
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/8343802.pdf
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/26132e9354bd9.pdf
    • https://static.s123-cdn-static.com/uploads/4424985/normal_60062042059b9.pdf
    • http://zuzorovix.scienceontheweb.net/raleridex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/topipovikapari/29098029254.pdf
    • https://s3.amazonaws.com/roware/civics_chapter_2_question_answer.pdf
    • http://wiwosotu.myartsonline.com/what_college_expenses_are_tax_deductible.pdf
    • https://s3.amazonaws.com/woxewiwupir/moragebuk.pdf
    • https://s3.amazonaws.com/fajujiju/99452589715.pdf
    • http://zipemoluligera.myartsonline.com/nogefitotajodudoresu.pdf
    • https://s3.amazonaws.com/xifabilejilab/ost_carita_de_angel_ending.pdf
    • https://s3.amazonaws.com/vikukinumet/epson_home_cinema_2150_user_guide.pdf
    • https://s3.amazonaws.com/dewutexorob/define_isentropic_efficiency_of_a_compressor.pdf
    • https://s3.amazonaws.com/zubuwujoxom/segitadopalotukokizepe.pdf
    • 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_off0000f5a5.bin
fe78d9f90b5780b0fb3a1bdd9391117a51505a89a112d2554ecf0de031408aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5576 bytes
font_01_sfnt_off00010880.bin
5792095734c1c383a03148b0c42f77123e3f8a93aecaca5bb59a1bdf04ba35b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10624 bytes

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