Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f40c70b6539f7f1…

MALICIOUS

PDF

67.6 KB Created: 2021-02-16 05:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 803d6f9c65deeb5f3d2428d1dd4253af SHA-1: 240c11fccfd5cf08d9b2131a092746939478e30d SHA-256: 3f40c70b6539f7f180472c3a93de8ce3dc63812c2aa1bb1b600e60903c7bf17e
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=explain+human+resource+management+function'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious URLs suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=explain+human+resource+management+function In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fcc51830e6ac.pdfIn PDF document text
    • http://brandframeb.com/2659659575apigc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_602447cf20ead.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/xazasifu.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/worabolizefakamobake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fd650b82c14f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fcde18b47710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe4a096f0d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b530d42973.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/pirosisob/60547146099.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/bekaviwiborikikujo.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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 5452 bytes
SHA-256: 7c659a2ec624c26edc4f9fc755c8c41be28f3ccaecfd088f6f7b90d8c4294fe2
font_01_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10200 bytes
SHA-256: e33429b19380a65d3490d69b14e6f3f0b1e0a179c62691c98de83b764fc558a2

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