Malicious PDF — malware analysis report

Static analysis result for SHA-256 625904589bca3a63…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 11:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e92be0ea3aba95bc35c95f057d2a52 SHA-1: 19d6dd3586ff4d3b81edabf3dcabebe647fcd7ec SHA-256: 625904589bca3a634604a9ebc2e115a7b67c7a1135b6a43314631b1a76bc9697
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://zajinet.ru/strik?utm_term=god%2527s+ultimate+way+to+health', is flagged as unknown reputation, suggesting a malicious intent. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=god%2527s+ultimate+way+to+health
    • https://cdn-cms.f-static.net/uploads/4366408/normal_60386599c4dcd.pdf
    • http://pozijuza.scienceontheweb.net/56074205937.pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_603da0af3dc1d.pdf
    • https://static.s123-cdn-static.com/uploads/4485813/normal_5fe0643d7f724.pdf
    • https://cdn-cms.f-static.net/uploads/4454824/normal_60133b84b4604.pdf
    • http://pebifakonek.sportsontheweb.net/demogutidubitokulozobufof.pdf
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5feebda42a395.pdf
    • https://cdn-cms.f-static.net/uploads/4383467/normal_603eabc90215f.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_605e1f476ea64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wopari/xapijeka.pdf
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_7beae200b09d4f838640bd670396caf5.pdf?index=true
    • https://s3.amazonaws.com/vigevot/cadena_alimenticia.pdf
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_eb7dfbdee2744f16b953b40e61e5f633.pdf?index=true
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_68a6ab85e6024bda952228186a356fa1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e70c71e-53a6-4be4-9241-4be06cce6730/organizational_behaviour_ki_definition_in_hindi.pdf
    • https://s3.amazonaws.com/farokof/93157886963.pdf
    • https://s3.amazonaws.com/xufujofaleki/b_format_audio_file.pdf
    • https://uploads.strikinglycdn.com/files/0ca17a69-4b88-46ea-b831-d28d6a34dad3/dbx_compressor_review.pdf
    • https://s3.amazonaws.com/xozeb/android_list_of_timezones.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_off0000efae.bin
8e286377f47352bb54d9d6d1acc02597eeac4a7113e59c918703c5768ec25c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5228 bytes
font_01_sfnt_off00010170.bin
79d2c50eb54075f71a186b4564e3832ab9e7b89c4e6ae9f9d081db1f1a4ecd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10968 bytes

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