Malicious PDF — malware analysis report

Static analysis result for SHA-256 1406e35f8447c571…

MALICIOUS

PDF

74.3 KB Created: 2021-04-04 10:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c3180ae9b4cdc89a9a87ee51ab0c1eff SHA-1: 6cc877d269a5b237d4dc6b409fb9ded21c85192f SHA-256: 1406e35f8447c571e8ff0083581473e00c327d6ff741870af32a1559095e4b15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/strik?utm_term=huffy+-+cruiser+26+women%2527s+bike+walmart PDF link annotation
    • http://xilatotes.sportsontheweb.net/kalender_2020_indonesia.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/tizimomodox.pdfIn PDF document text
    • http://xonigej.mypressonline.com/character_perspective_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_605f454f318f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_601d7b5e1f9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_60614ef8ce048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fc8907d4005d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5fe1c6003fc65.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/wijolutono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_600c1732a9b3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/146cc686-8b16-4735-be08-2e63af44a7fb/valentine_one_radar_detector_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/76179274618.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/species_reference_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73c65b3-b807-4857-a5ac-dab486f4b9cd/does_autozone_recycle_transmission_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/32329595638.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/what_is_better_real_id_or_enhanced_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ceb09f9-850d-42a3-840f-3d4b8b3620ed/zopexidusesodisa.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/iet_electronics_letters_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0055623-251b-4a2a-a6be-1bbab589d266/95761250552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43038e69-99fa-44ad-8924-5c642aa1e247/gupemiduvowinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a79df2d-554c-49d8-b91b-80a9848cae01/city_of_thieves_adventure_time_gif.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5736 bytes
SHA-256: 44c7ec3420453061876a6ea7330635e7aad51b4668eab37c8101bbf28b61ef5a
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10572 bytes
SHA-256: c7541d526474af5fa8d574efb3af545ca100f440f59867d2974c4f22f4d8233a