Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e964dcd9b910e11…

MALICIOUS

PDF

73.4 KB Created: 2021-03-30 00:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c83e97da46c87bec4791ba4fb912d707 SHA-1: 9efe72c6e7282b5c812a4e36e2527d889e9d9ead SHA-256: 3e964dcd9b910e11beb180bbb0d7bbbf6424e4df8b62cfae62aac7de4c8190c4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru' and containing keywords related to cracked software downloads. This suggests the document is part of a phishing or scam campaign designed to trick users into visiting a malicious site. No scripts were extracted, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to potentially harmful external resources.

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://vilenefex.ru/award?keyword=pdf+to+dwg+converter+download+crack PDF link annotation
    • https://cdn.sqhk.co/tiluzegata/jijjjij/13968335997.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/hv3QJgi/tip_top_restaurant_catering.pdfIn PDF document text
    • http://lotiruwibek.iblogger.org/new_moon_stephenie_meyer_book.pdfIn PDF document text
    • http://wabowiwajej.iblogger.org/tazevesukine.pdfIn PDF document text
    • http://mekozeka.66ghz.com/cremation_memorial_service_program_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_5feb866980ec7.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ZgdqrW5/supurisozediviwit.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/ca3RibP/monster_truck_mayhem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_605d83fdbd77f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_605a0ca7dc633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6032de8d48adc.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/jeig4ja/aaa_logo_design_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/0gdrig6/baby_animal_coloring_pages_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601ae117c7e5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozikidifalov.epizy.com/tenadagov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a3eddb-6fda-4bf5-85e3-8002566adecf/varowak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e870f81e-9313-4355-bd1a-7e34fcd3c624/fibuzej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b00d11a-a1ad-4f13-807e-0a21231e18b8/how_to_fix_a_sky_rover_helicopter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e302551e-f95c-4164-9aa6-73fa108a0b4f/52884932210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e66cc1-0974-4a07-868d-6b1d4c75bc9e/viromiwakaxagaxololefi.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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 5228 bytes
SHA-256: 4b0c86d9dcc77b97ab2f83263ed6e9bf4df2cb4dfa8198af20529c12719fb2c2
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 11008 bytes
SHA-256: ced5b48067e03f943b16e61ad3c2e9f956cd2e8a3285b9b2b621c0d3f515b1c8