Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe33652fd3d0d6…

MALICIOUS

PDF

60.9 KB Created: 2021-02-18 17:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c44c5226bb4ba28948ef38765d8f9efb SHA-1: 9e6cad39fa71c60fb9718248c55b1656c79a0545 SHA-256: bcfe33652fd3d0d6898cb8183f50b9037e85a97a41b5085e8f3a4dcc64b282de
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan distribution attempt. It contains numerous links to disposable hosting domains, suggesting a link farm designed to obscure malicious destinations. The presence of a link to a known malicious redirector infrastructure further supports this. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://crophysi.ru/strik?utm_term=air+fryer+recipes+for+beginners+uk In PDF document text
    • http://wumalazari.22web.org/dazenase.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/aNij6jh/army_builder_app_40k.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/aiagfaO/71800707316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5fd912844a28b.pdfIn PDF document text
    • http://retapobu.iblogger.org/install_flash_plugin_chrome_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hcCjgBa/turbo_stars_crazy_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/h1auidH/xovutito.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/qgijdid/splashy_rain_suit.pdfIn PDF document text
    • https://cdn.sqhk.co/tagorotage/gdljcjb/74421949631.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ajjVgdB/29771680371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://musowafotoxipid.epizy.com/what_is_canonical_form_of_pde.pdfIn PDF document text
    • http://mefiniwaz.epizy.com/cairo_dock_themes_package.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/bulldog_francez_blue_informatii.pdfIn PDF document text
    • http://wapanemajefo.rf.gd/safety_data_sheet_lysol_disinfecting_wipes.pdfIn PDF document text
    • http://loruluze.epizy.com/59384400713.pdfIn PDF document text
    • http://tamegebodow.epizy.com/grand_daddy_purple_grow_guide.pdfIn PDF document text
    • http://nilidori.rf.gd/29343452272.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/personal_development_plan_template_free.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/26842488571.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/mibuxipemakezowop.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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 5236 bytes
SHA-256: 30b86958184b49f68e5549adec1300648f11471b89a3c43f0e00105f4cb23845
font_01_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 9688 bytes
SHA-256: 474027d7799d76c7a2de0966d58de1ad3eeba31faa6604c1d45401af5ace2dc5

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