Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c688a53b709373d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-27 19:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3cc05d2fc0ffcef647a0268e5cf7c8 SHA-1: ba436c9bf34f2674c517ca60d3d03b8c316c4115 SHA-256: 3c688a53b709373d4a029dbcec6e4992ac359d15e47de1660faf0b511f4da849
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a potential lure for 'barbershop 1 movie free'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=barbershop+1+movie+free
    • https://cdn-cms.f-static.net/uploads/4462379/normal_6009ed5ae03d4.pdf
    • https://cdn-cms.f-static.net/uploads/4477651/normal_602a201ddb7d4.pdf
    • http://dorightunion.com/jajekerevurol70skb.pdf
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5ff24eec0cce1.pdf
    • http://kufemotobenin.66ghz.com/xigakasopa.pdf
    • https://cdn-cms.f-static.net/uploads/4407996/normal_603151beb0aec.pdf
    • http://fubikopelemom.mypressonline.com/what_are_negative_character_traits.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f95d3c049.pdf
    • http://kakorixow.mygamesonline.org/fukabomex.pdf
    • http://instas.site/jumping_spider_habitat_for_sale5erc4.pdf
    • http://lasinonid.iblogger.org/rurirevepalugini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_db286f6371a541c38f4b1703a12c183a.pdf?index=true
    • http://wenadudik.rf.gd/21244260258.pdf
    • https://s3.amazonaws.com/lurutopobi/3598223500.pdf
    • http://rifobotulaw.rf.gd/miwetowegogonudinopamag.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_3afda3fa17454d78855d6c3927ded640.pdf?index=true
    • https://s3.amazonaws.com/pazatuv/36629225265.pdf
    • http://sogulonogob.epizy.com/jaguars_news_bleacher_report.pdf
    • https://s3.amazonaws.com/vuzotisenixava/1709108090.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_a38e182acbb94316bb18e846b230ba25.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/accountant_experience_certificate_format_doc.pdf
    • https://s3.amazonaws.com/xapidajovaji/kelvinator_ac_remote_manual.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_off0000ffdf.bin
535ba17ca1af5e26aee9214da10f98a789701635b37560cd6a380d0acf930b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 5412 bytes
font_01_sfnt_off00011225.bin
a44b7820ddb85dad134bd9dd14f6f0aaf5c34d32216d1bfbb36f2086651571a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 11040 bytes

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