Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a0467398f4e61c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 18:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db09403260cf2d10d3ecf8f268fe5673 SHA-1: 72f9ae0d127f2b13fb3be0582d06881bcc35c7c7 SHA-256: 17a0467398f4e61cd0f3bd84ac1300c5f6b75c7a2bb1e718c375e070cb216db9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body contains garbled text and metadata related to PDF generation, but the primary malicious activity appears to be the redirection to external URLs, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=bernina+artista+170+original+price PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/iciYTN7/road_traffic_signs_test_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/gc3jdjd/rezub.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/OsghmHS/79596967713.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/iibXUQm/stickman_warriors_fighting_simulator_codes.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/sony_dsc_rx100_ii_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/bQeifhj/13557718230.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/KhcEF8e/rebififawugagarorimanubez.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ruhcljc/best_camera_app_for_dell_laptop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_c0368d7d34c346fa9829cb9cf6cbe678.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91dfbf6-af0f-4391-9982-da729b547f9e/what_is_error_code_10017.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_99ee1a47173a4cf3a9dc4039c2cb0e13.pdf?index=trueIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/new_english_book_store_amsterdam.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/drinks_at_dunkin_donuts_not_coffee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94134ec7-9446-456f-9cc7-c526d188fe8f/is_there_a_season_4_of_sword_art_online.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_42202dada14d4d4d879e1ec406e65cb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d863ec18-805a-43a7-8e71-5d9a70393715/gukodemidisuwaj.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_99b7246821d74cf69014b521efdcf3ab.pdf?index=trueIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_19c4fab1fb864eddb7f233b77cd24c6c.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_ea376360671649dd8029c91c321c4e64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8780a68d-512b-4766-8804-3536dcbaa44a/56943612150.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/map_of_the_world_continents_and_oceans.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_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 5424 bytes
SHA-256: f85bb646eb4f94145e97253d42ba1baa0f28cd0e6890b8463cf291667407a05d
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 11092 bytes
SHA-256: 9e299314bf255d05c8e9d0459888e9225f341cf40265e8a0c82c48c05d8c4d1d