Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe5531ac8b179b1…

MALICIOUS

PDF

70.4 KB Created: 2020-11-17 02:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 99d306ae2c6b07f307bea780d5adec82 SHA-1: 78e2b868d3bac431ccb13685049a75c5c59ed0b7 SHA-256: 7fe5531ac8b179b17402780b87000ecbe98ef7eab4a9dffe8ea2dd3115243baf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites.

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://gettraff.ru/123?utm_term=el+cartel+de+los+sapos+capitulos+completos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f991e2028d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f87369819176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f91f794b9cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8907fe10ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fa114b77edfe.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/2316966.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/dbab0b62cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f9457502ee47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f91d9dd06f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5fa1651e7560d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f888d8d11005.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/1d30093c-bc64-4bdb-bd9a-5f3d85e25eee/geometric_proofs_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/77673458364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb68f1e3-d6fb-4db8-860c-088e974fe48f/fimogeziz.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/22813528027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077a8f00-95b0-404e-a3b0-0f1fd343a2d5/elifba_full_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144ec605-6f03-4d13-8655-2ba5c010f35a/zigefumogafu.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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 5176 bytes
SHA-256: be4071f3214ece46534a83f194c5562047cb3b473cd6a48f9dd23b9c76f97793
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 11764 bytes
SHA-256: c09b6e0c5ca240097f51e0b93f64f35eff10eb4efbb41235d2b2c004c6561f94

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