Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ebd689c6d9ec78…

MALICIOUS

PDF

72.0 KB Created: 2020-11-17 22:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9b58385e60be212e19ced1fcf8e3a7e0 SHA-1: 9675218c444a1cb2ed62a8e2cb842898a66746e5 SHA-256: f7ebd689c6d9ec7862caed4906c0a4a6261500d9b1eda864476daed5c2c757ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://traffnew.ru/123?utm_term=what+to+put+for+desired+salary+hourly', is likely used for phishing or to redirect to a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=what+to+put+for+desired+salary+hourly PDF link annotation
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/puwep-jusulanafuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f96f1bb271b5.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/af6a589b35913d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5f972b567fa45.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/susopuzupure/bobimaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7e4c16-a68e-44dd-b980-c8db3527e243/sefodimefutinatefatopatud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc1e893-c358-4f60-ae0c-cd50c2cd6eca/4660647231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7713d03-ec38-4911-82f8-dd60c71b43c6/sinipizixipegerol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e2cfdf-965f-41a2-9d9f-4257c02ebaf4/51989290954.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/download_rabbids_big_bang_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb7abe0-e982-497e-b66f-4c07f5b99d53/jobawitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a128c80a-5128-40ca-a399-28bd39e4c478/dewusebifowasalu.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5244 bytes
SHA-256: e11a45fd2d995fcc44f9a2f6f49ab04be13128bfd5967d0451b1e55362fec477
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 10884 bytes
SHA-256: 38248b905349376428ec88d6daa8ea11c7ba3e41c291d20fcf42ad6affb03aff

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