Malicious PDF — malware analysis report

Static analysis result for SHA-256 9692a7bf57389a7d…

MALICIOUS

PDF

71.6 KB Created: 2020-11-24 12:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1921d8aae7e5ec24dbfa80bf58626844 SHA-1: 7262e0ff6cd23acdb101c3a96e5ccff9dc162add SHA-256: 9692a7bf57389a7d1629870dbed085e0e34bcf49d53543ce4fdca82caeae195f
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. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to drive traffic to external sites, likely for phishing or spam.

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
  • 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://traffking.ru/strik?utm_term=nursing+social+contract In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fa3f2816a0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5f9824664dc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8838198f1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fafbcdc54015.pdfIn PDF document text
    • https://riwuwodanujebu.weebly.com/uploads/1/3/4/2/134234990/5468486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f88ac3e5fa24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5f9c6284cd532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fa9c91592411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fa83c864d39d.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/36af3aa6d3.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/0f0ad1a4-a6c6-4119-a273-bc0028b6c98a/pudunoxonuwepon.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 4936 bytes
SHA-256: f17ab8496e7f7c5f436899df12cd46168930a15dc11fa317f27baab5798122a7
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10152 bytes
SHA-256: d6bf958682932ecbcf39a182f499615dbaf30ea4a255d0a262ae3dd79ff7db3d

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