Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4114f5d88cc10…

MALICIOUS

PDF

76.2 KB Created: 2021-06-04 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 32d3306ed8f1a4ca14a720d64c18099a SHA-1: 247333f361911ef66e1340b578cd029bb86a2023 SHA-256: 8ff4114f5d88cc10363af8c37d3d9f0e4e78d41c5532df8cc73fc4237a0bb3a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pistant.ru/pbw?utm_term=online+newspaper+wordpress+theme PDF link annotation
    • https://kikurizup.weebly.com/uploads/1/3/4/6/134694954/jutavages.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/7388ab0fe8.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/9a96d648ec7.pdfIn PDF document text
    • https://bavutenodedob.weebly.com/uploads/1/3/1/0/131071315/warurewu.pdfIn PDF document text
    • https://xozemupugumofu.weebly.com/uploads/1/3/4/3/134320042/db2d39cbd50d.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/0768ba82c5.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/8171313.pdfIn PDF document text
    • https://xajavixakopus.weebly.com/uploads/1/3/4/8/134898113/wakenoledixani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f32e0b5e-078c-4b2e-920d-dfbaadd4667b/99574692232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1010a9-ad0b-4d36-9336-21981159caeb/who_has_more_midichlorians_yoda_or_anakin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69194856-7368-46e8-aa04-9d1cd1eb1644/does_xbox_have_a_free_fortnite_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed205fbd-c6ad-48f9-9bb0-47136eb49c2b/23918804013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ec6476-06d5-4075-9879-8375c3794012/63507369935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e973e8de-e50e-427e-bb25-bb088e662c79/93137635671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347f7dda-db95-49b6-8023-31fc2d5e00ff/24_hours_a_day_aa_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127cd405-ea35-498b-af20-3f672b0afa57/nakukotaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5104 bytes
SHA-256: a4683ba369ca25482b04a98ab3aa75eeb799c8c8208ff338fd5c95eac4e2fd18
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10624 bytes
SHA-256: 3cc6d6fe27d630182774fd3e3d6227126d46611f1289dae5169b67deb6f3812e
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2