Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3dc9c1c32430d7…

MALICIOUS

PDF

71.9 KB Created: 2020-12-17 04:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bd174480afa2afa76b3daf9b46bf2c4b SHA-1: 7fa5ae9c2b835d23c18d16046fff86aac0803893 SHA-256: 9f3dc9c1c32430d7c59fbd879c63ee6972e6e477ba3b1549fa01b19e49bf50f5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a significant number of external links, with the heuristic 'PDF_SEO_LINK_FARM' identifying a mass of external PDF links, including 'https://jobikituloxexe.weebly.com/uploads/1/3/4/4/134456837/viwopow.pdf'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or content-luring tactics.

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
  • 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://trafffi.ru/strik?utm_term=because+of+mr+terupt+pdf PDF link annotation
    • https://jobikituloxexe.weebly.com/uploads/1/3/4/4/134456837/viwopow.pdfIn PDF document text
    • https://nozigofomin.weebly.com/uploads/1/3/4/4/134481739/b1a35c80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/65ec0ab4-d679-49ed-b960-dd3459ed28f1/nibowomodij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400b724f-ae9a-4144-a111-e0d706aa362f/60797259683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4fc735-27e6-4b9e-bf2c-fae491c82630/disukuvifafer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fc4c59-1bf5-49b8-a0ed-b43fc6ddf594/nature_of_science_study_guide_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0296f1b3-8d2f-4b91-b745-8a7c0c0adbba/brad_yates_tapping_for_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05305209-998c-41c1-9d3b-8f0e294a9b34/36821104449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d618a9f4-46d9-439d-a952-6e3a5c1ad5d3/free_ielts_reading_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e4aacd-62b5-4ba5-8885-346cfb4ef2e8/walmart_stocking_job_duties.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b98048c1673e559ebd3e/t/5fceb523b4902412734b6984/1607382307605/walokonikepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17f0629-57de-471d-9a50-3f8fc5ae751f/xoluna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f015eff-8014-418e-9350-fceab5e9078a/google_photo_gallery_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3b443e5c7695ca9ad1d73/t/5fc8700edcb5b260797c2172/1606971406506/pulse_ox_levels_normal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 5044 bytes
SHA-256: b2f9fc59bf2f077301d7e89138772c3f8e2d7bae35fa5ddd2329a5c627812053
font_01_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 10440 bytes
SHA-256: 1d5aa84fb64ff281bc9a2695a5746c43db83c51301982d59bfd5bd3a2a8b584e
font_02_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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