Malicious PDF — malware analysis report

Static analysis result for SHA-256 b412196310b4e38c…

MALICIOUS

PDF

73.4 KB Created: 2021-02-26 23:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0a33e769a2244b92279cbd70832875cf SHA-1: 74dc601c952731868ae00a349df2946880e78777 SHA-256: b412196310b4e38c3a5f65964349977bc060a080ddfbe0c84a3c60dbad216f99
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or link-farming attack.

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://zajinet.ru/award?keyword=how+to+critically+evaluate+a+scientific+paper PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406169/normal_5fcd6177d2096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_60187af7cb36d.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/dwG1UWf/lighthouse_cafe_menu_streetman_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454048/normal_5fee117c5561c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_601af0399b3d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393044/normal_6008dcd3d309c.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/609606e.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/cf9362fa8e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5ffb78f97c48f.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/yAjf4as/itopya_haz_r_sistem_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_601d7ec36b6e3.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/vufupu/cgst_act_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/nupojoxukubulujidoval.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/finding_square_roots_using_prime_factors_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/genikapinasasafifuwowe.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/ashes_cricket_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/articles_of_confederation_student_worksheet.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5224 bytes
SHA-256: 36d52079da85bedb7a0b98b7c9cf464dfd3f3ac74a076afee1dca1c2ce9811a1
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10824 bytes
SHA-256: 3fdec339037bfec01a10a9c5e703a170078492dd0a23bd9233cddc06a345d623

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