Malicious PDF — malware analysis report

Static analysis result for SHA-256 68936db0b8d6e8dd…

MALICIOUS

PDF

68.9 KB Created: 2020-12-16 23:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d86123b3057495d6f6fed28a23332bb6 SHA-1: 17f85997fe0b72a1bc3341b6f8f462e203756b39 SHA-256: 68936db0b8d6e8ddc9ed37800c9cfec06490d671c0c46acc726a5fbaa729bef5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous PDF links suggests a link farm or a method to obscure the true destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/strik?utm_term=lapse+in+judgement+example In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_5f9792ff5dfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_5fb2f358b3d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fd81e71ef551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f8e51b6d2f76.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/wanelelukoweger.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/bexolamabad/bjd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/ryobi_18v_one_battery_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bepabatagisevolago.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/fallout_3_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/6261365023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8163684d-642f-45c0-8b18-78c2917a744c/96673310858.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf6759ee0f32b87193ea7/1606284917990/polyatomic_ion_practice_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/nisofakuloxoja.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd8a92bbd740658005df2/t/5fc2f09b3485235c862810e2/1606611101011/rc436_rice_cooker_manual.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_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 5268 bytes
SHA-256: 803ad4d8cf0c163671019b5c58d7439385507afcf4a3b4ebb0817a1e051520fd
font_01_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 12756 bytes
SHA-256: e4bdfa19b34543b8bd54b1ff28cbff1b000ecfa5b9fc846b15c9209682aa3a44

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