Malicious PDF — malware analysis report

Static analysis result for SHA-256 da55eba33758f357…

MALICIOUS

PDF

46.6 KB Created: 2020-10-16 05:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0b8eff39ff937e623505a9dccb8bea01 SHA-1: 890ad5493651df2daa2fa1fc5c847b3f67c6d428 SHA-256: da55eba33758f3579a8e1500be4f8061dc8f7c877395c1da7cb18734aedc71de
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://cctraff.ru/123?keyword=ensayo+sobre+la+matanza+de+tlatelolco+pdf In PDF document text
    • https://site-1043925.mozfiles.com/files/1043925/61796201094.pdfIn PDF document text
    • https://site-1040675.mozfiles.com/files/1040675/73030949283.pdfIn PDF document text
    • https://site-1043646.mozfiles.com/files/1043646/zazadekeki.pdfIn PDF document text
    • https://site-1043291.mozfiles.com/files/1043291/call_voice_changer_pro_apk_free_download.pdfIn PDF document text
    • https://site-1039923.mozfiles.com/files/1039923/17779950572.pdfIn PDF document text
    • https://site-1039187.mozfiles.com/files/1039187/kefej.pdfIn PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/yardworks_21_lawn_mower_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f87be71c4b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f88c63c2d691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f87b8905237f.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/49b86b5abb46524.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/katemofiseturoj_lakagez_kunajomeba_tajofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f89039be5a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f874c2bd4bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f88d34e30a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f88bd49b2c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f86f5a28f8af.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/adc25099-067e-44b4-ac72-5e286c588cb3/mowiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34146f8b-aa07-477a-8351-458631a8ac51/kexajinemutitepepur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2303e0d-e0cf-4c9f-ac78-4ed1bca9fb2c/70582122516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b59ec1-c841-4bd9-81f7-d7dead76d70b/75332566598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79dce49d-d9e1-4097-b953-8327a0135647/21841381798.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_off0000731f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731F 5552 bytes
SHA-256: 2ea10ef34e5323f8e524fec9dd8fcecb089da1a0776dad29dedccba67b21299c
font_01_sfnt_off000085f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F1 11340 bytes
SHA-256: 383d2973be624d92c68bb3456116f505284c4c66d800e065b3684fc427e093d3

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