Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f67d09f934080f…

MALICIOUS

PDF

66.3 KB Created: 2020-11-10 01:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0ff747f76d27112658091802a3217def SHA-1: 7c80c716972b8011c7f40a041566edef113f8aed SHA-256: c7f67d09f934080f63a6e6e29a94e50540b08f3efd4d2938985cf3f6427b30e4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://trafffi.ru/123?keyword=dutailier+glider+replacement+cushions+11780', appears to be a lure to direct users to potentially malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?keyword=dutailier+glider+replacement+cushions+11780 PDF link annotation
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/7057778.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/vudiputo_rosufu.pdfIn PDF document text
    • https://wabewubo.weebly.com/uploads/1/3/4/6/134670528/5ed9874cf825.pdfIn PDF document text
    • https://wubaruduxosekur.weebly.com/uploads/1/3/4/4/134484821/saxizis_xomuzodazebesur_bugakapiw_nezatorosu.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/zuxupixo.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/tesej_jedos_gefimig.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/4bba0e0088.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/sirilagewuga/58956714143.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fagodanur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6222cee-c829-4f2d-b521-4d3bf3eee17e/bedobazowojeliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494601a3-ee9d-40b7-bad9-d5d9917d0ef5/gobikodosawegowig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7149df-205f-473c-b85d-d8134e8cf82f/xepit.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/7.3_cell_transport_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3623c77-0530-40e0-a290-c64bfcf1a113/82256628882.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_off0000c1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E4 5956 bytes
SHA-256: 5ee58729e8ea6a94b13186c565b4265e7c9c6a1082816f915b17756f9d015049
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 11220 bytes
SHA-256: e3f1c703f116e2bce388f95eb89c9d3b2cec1cde184dce13e717837f5ddf5ad0

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