Malicious PDF — malware analysis report

Static analysis result for SHA-256 e855a8d6bcabbcd6…

MALICIOUS

PDF

79.8 KB Created: 2021-01-19 17:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 074be5604f7ece88dd053d40f7297582 SHA-1: 75c5a517ebeb20e23a54caebc52d0658d6cad839 SHA-256: e855a8d6bcabbcd6ddd731edd02ea55bb3d14d78c55a45e50352856bbc31ac9f
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffking.ru/aws?utm_term=microsoft+net+framework+v4+0.+3019'. This URL is presented in a context that suggests a lure for a software update, likely to trick users into downloading malware or divulging sensitive information. The ML classifier and ClamAV also strongly indicate maliciousness. No scripts were extracted, but the presence of a malicious URL within the document body is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/aws?utm_term=microsoft+net+framework+v4+0.+3019 In PDF document text
    • https://cdn.sqhk.co/jaguwubax/uxghYgi/free_food_events_near_me_today.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5fe05bb6a27a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5fb733bbe3afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_5fd84c9d1c6c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fc689e29e3bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/1B8FSMN/99605524117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f94c4a6d732d.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/hjKghUZ/underwater_vr_experience_kalahari.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/nc0igje/40827300179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_60067551b6a54.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/memul/memipefikopimukolus.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/mutesulukefopufekekem.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/watamukufageb.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/arcgis_pro_update_failed_server_error.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/40904633802.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/16943534911.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_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 5848 bytes
SHA-256: ca80250bd89305065e5703abb24f2375b23b6454a67645584daee6073d111b4b
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 10244 bytes
SHA-256: 40ecb3a0022d3cba41cb33d6978352688ad4c18e69c0eac3cedeb4ce833fd149

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