Malicious PDF — malware analysis report

Static analysis result for SHA-256 9131f5623116c559…

MALICIOUS

PDF

58.3 KB Created: 2020-12-06 23:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0a20a19d628d6219b41f714b2902b356 SHA-1: d206295c3d3fe13d223424479e266df26246d213 SHA-256: 9131f5623116c559a536b25a9724d24e839f713be3cac7752d58687b61a61cbb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and embedded links suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafffe.ru/123?utm_term=vocab+level+f+unit+4+synonyms+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f86fc0258a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f874d1dd679d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f94a0f777996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fcc7255dfe13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f8b18286975c.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/ab82e48.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/5fc0d9d540f1034a5ca886a6/t/5fc4ce832dd96f591884d16a/1606733445874/the_simpsons_season_30_episode_12_dailymotion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dac460f2895dc1e79d89/t/5fc4b1759ee0f32b87e84cae/1606726011132/painting_the_roses_red_daylily.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/48536060636.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37ea46b97992eb56c3d7c/t/5fcaaeffa400d748f5c303c6/1607118591224/fefudisuli.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/jose_rondon_scouting_report.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_off0000ab42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB42 5476 bytes
SHA-256: ded96ba0d7d25bd1ea62dab4e591010de9bc9d0b268fa2bb8536d0875ff69abb
font_01_sfnt_off0000bdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF1 9136 bytes
SHA-256: a3714796c6fd6c97a3b23dcc2c0309e02cb737182b8dabd10e9b8c5b284973f9

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