Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e4e0cdcb05f178…

MALICIOUS

PDF

81.0 KB Created: 2021-02-19 00:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3649e2b2fa160bfeaa68c6bc63d53e56 SHA-1: d078db9cbe0d3a84be69c09afdf4b498b9fa5267 SHA-256: 42e4e0cdcb05f178e24f4eac19540d4bd05f155fd6c107e9ae97718190cea83a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spam campaign. The embedded URLs and the heuristic PDF_SEO_LINK_FARM strongly suggest this malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what%2527s+the+best+romantic+comedy+on+netflix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5ffd833843414.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/1e53a5b4e30.pdfIn PDF document text
    • http://xezakekefeba.iblogger.org/answers_traduo_para_o_ingles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fca923844f0e.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/stickers_whatsapp_memes_apk.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/sokisis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_6027b7dfdfe25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5ffab381d12ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_6023127a8c8f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5ff1f5cbd1f3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_6001103123017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5fdf97bf988ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486363/normal_60095e5539edd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/turip/bedusineve.pdfIn PDF document text
    • http://kazowaz.rf.gd/3525337994.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/adam_4017_utility_software.pdfIn PDF document text
    • http://nenilezum.epizy.com/center_radius_form_of_the_circle_described.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5404 bytes
SHA-256: 83bb7745f477d84ed025061abaab59418b503cb67f9584dffce7feaf7b94bb68
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 11124 bytes
SHA-256: 34a058d4a5964de3b3b4572acca78fc2085b66f4d6dc92dad76f9c6ffd3709eb
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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