Malicious PDF — malware analysis report

Static analysis result for SHA-256 e453641be1d7f895…

MALICIOUS

PDF

66.6 KB Created: 2020-12-07 09:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 721c33eaf88ea703a21a74867f3c71dd SHA-1: 75598f62c24fc9e03774c8cdcba7c6acc2fc74ad SHA-256: e453641be1d7f895523bab7eafad662f34dde32c468ce1f526d8fba3db96a88a
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'trafffe.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffe.ru/wb?keyword=b%20p%20handle%20full%20form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f87c2113bcd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5fcdd53aa8b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5fa1ab31cf123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc13af71c8c7413143404cb/t/5fc533483485235c866ecc5d/1606759242030/baganezudimido.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c05eb8467722f1ec93c2/t/5fcdae6d0ab5d62feb1036fe/1607315055980/89439927714.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f56dd26ff1194f8deacd/t/5fcb09b58dcc5603beed70c3/1607141813179/meme_vs_rage_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/business_card_facebook_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d48cd64a3343a5f4b73b/t/5fc9cc10887b444c6156d445/1607060497504/find_netgear_switch_ip_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83056f2-2cb6-4e83-9b16-b3e1ccf90ea5/27154991820.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fc138b8bc819f1cf404979c/1606498488780/71832166874.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe33535147b14804fdc1a6/1606300506233/ronefojomonivisijomo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1651bc89e1c4b8fc1e357/t/5fc9ff4e822fbd3263e3ae14/1607073615582/felaman.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2814bab79f442f233bc55/t/5fc3dee7eaf37e3b6413038a/1606672103408/fiwozozogenojusalozor.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/fire_rated_expanding_foam_data_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5b911972c46e3c962449/1606376342245/69134204177.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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 5152 bytes
SHA-256: 6c13225c075f9ee183cdeeff04d4dac984c1cfa4d6862a767a8da515f05439d4
font_01_sfnt_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 13556 bytes
SHA-256: 1d74cd00385553b70f3bb43b58ad0f78bdc6373df89efb9f5eeaa674db210d13

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