Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11422edca4abe26…

MALICIOUS

PDF

72.4 KB Created: 2021-01-22 10:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4414f1caf876bfc2e71b195272da172 SHA-1: d1bc489bbb358dd2c1ea0bf278311145107cb590 SHA-256: f11422edca4abe266c83db9433df23058b85b73240d4fcdfce41c5e06d2017e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

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
  • 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://jacksth.ru/123?utm_term=the+widening+arc+guide PDF link annotation
    • https://site-1185944.mozfiles.com/files/1185944/judujobakokorabu.pdfIn PDF document text
    • https://site-1176460.mozfiles.com/files/1176460/64815313729.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/5453603.pdfIn PDF document text
    • http://fafasun.iblogger.org/avery_5161_label_template_word.pdfIn PDF document text
    • https://site-1174987.mozfiles.com/files/1174987/70984401100.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/631675fad8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabupumow.epizy.com/lepokegagabubag.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/bootstrap_form_validation_checkbox_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/come_on_get_happy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/b_ed_form_2019_kanpur_university.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/celulas_caliciformes_del_epitelio_respiratorio.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/89999784155.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/wedding_invitation_writing_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/jurnal_penelitian_pendidikan_agama_islam.pdfIn PDF document text
    • http://bizebiza.rf.gd/dp_bbm_animasi_bergerak_islami.pdfIn PDF document text
    • http://botozagelexi.rf.gd/formal_letter_applying_for_a_job_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/69285789352.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5032 bytes
SHA-256: 73821b96f382775b26d2b0fdff616a9bb6e8daa74247f321f7fc6d6c166052f1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10428 bytes
SHA-256: ef47a35a8bb848b52c196cded3b79b31192875fdb74e70b070d02c97060269d5

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