Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d41e18b277dbe2…

MALICIOUS

PDF

77.9 KB Created: 2020-12-27 07:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 24ee04dda84521f900a7f7684f5be5c2 SHA-1: 6d50a701d6d706491ae9ee293b552c3cac01e63c SHA-256: b6d41e18b277dbe28471e7d1223c8ecf53bffc9877ed96a92797cbb3d80d281f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. The document body, though heavily obfuscated, contains text that appears to be a lure for freebies, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://traffine.ru/strik?utm_term=freebies+by+mail+october+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fdc21f7e0908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5fa2f9833bbe1.pdfIn PDF document text
    • https://besukefovubon.weebly.com/uploads/1/3/3/9/133997228/623b4b75e0.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/toful_biven.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fe51d8fcf5c7.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/fomogegomotimas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5fc71984a06a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_5fa366f3e3303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5ad81f-7bcb-43ff-a99b-b8514df4b984/83086474177.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/informant_series_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9905b8-4032-45a7-9a9a-d7d603a24204/26315523296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5e4dad-ee96-4df9-ac7d-d92c758bfc69/pagugoxojuxarawemu.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/ktla_news_traffic_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6d6461-2466-4483-bd5a-19e0798b8c9e/84772333574.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/bramman_film_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 5416 bytes
SHA-256: 75b7929f61aa48aa51d04581d115f64c35ed0f32b03b23d3f7b374bb366c59c9
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 2140 bytes
SHA-256: 289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34
font_02_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 11340 bytes
SHA-256: b967b2fae6309ac564246c3bd1f88423264e91e4352ddf0542f878e1bd4fb4ea

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