Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b513bb45ed79b4…

MALICIOUS

PDF

90.8 KB Created: 2021-05-24 21:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7fa6543529a5eb07ecfaa1cfa982b007 SHA-1: ca988ff2d24046482a7d75cfeb55c7a4e5f4b0eb SHA-256: 65b513bb45ed79b4f2dd79c328c19fa4b53e0b7befd39b869c5b35a8c0a97d35
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a mass external PDF link farm, with one prominent URL being https://leonvi.ru/strik?utm_term=roles+de+los+grupos+formales. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to a network of linked documents, potentially for SEO manipulation or malware delivery.

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://leonvi.ru/strik?utm_term=roles+de+los+grupos+formales PDF link annotation
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/7bd3bdf27005.pdfIn PDF document text
    • https://vigujixuvavotuv.weebly.com/uploads/1/3/5/3/135391978/1312056.pdfIn PDF document text
    • https://gozataxuwo.weebly.com/uploads/1/3/0/7/130740141/4354178.pdfIn PDF document text
    • https://kupikonawu.weebly.com/uploads/1/3/4/8/134882044/vedujevefolugi.pdfIn PDF document text
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/fodatogawixudu.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/108672.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/dexasivatebonel.pdfIn PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/maxajid_zerekozatuj_tejivotuxojenaf_beruximo.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/b30d6feb13f.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/9950576.pdfIn PDF document text
    • https://buxevuforuwax.weebly.com/uploads/1/3/2/6/132680831/40a05.pdfIn PDF document text
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/sowujesukekegoxaboso.pdfIn PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/36587a.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/sizabo/whiter_shade_of_pale_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/93311476978.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/sql_server_2017_linux_developer_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/29678685053.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/student_management_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/watir.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/carpal_tunnel_in_pregnancy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/solutionreach_sync_launcher.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/hatchet_book_questions_and_answers.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_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 5368 bytes
SHA-256: 1776bcefbacc52d24b494f6abb1d1cab0f3b7044ae6c97bc939cd9506a858a63
font_01_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 12176 bytes
SHA-256: e4ff35342abe6b655e1585c5344a78f8fe8d17f628cbd247ab4ed421d5267147

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