Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e89fbb01fc3aef…

MALICIOUS

PDF

81.4 KB Created: 2021-05-21 23:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb47d74f4d5837a965eda3da437b9a71 SHA-1: 7643b97c1e7728c6dbb55021b3aa78c69a61c65a SHA-256: 55e89fbb01fc3aefbd5a48aaa42206361105d68d98f3d7bbea896db72751eeb3
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or spam content, potentially as a precursor to further compromise.

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://dugedepap.ru/strik?utm_term=plantilla+para+hacer+un+prisma+triangular PDF link annotation
    • https://bavopubenexe.weebly.com/uploads/1/3/4/6/134678362/dapapafutuwarigonidi.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/jorirefubara.pdfIn PDF document text
    • https://xonoxiti.weebly.com/uploads/1/3/4/6/134679971/ravariwawalalum.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/bazujijujagopezopib.pdfIn PDF document text
    • https://gabudusufixojur.weebly.com/uploads/1/3/5/3/135339303/nikesareb_punut_kuvidapomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_601ede199e1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_60527ef8b3d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_60011df6c4df6.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/wibekidaba-fazipisa-zoturulebu-buzanevupogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fd27f9b2a463.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/2b47d0e4b10138.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/rolizuzakibo.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/dc2065d8-3e4c-49ee-82b8-7cf31706f004/kenmore_700_series_washer_control_board.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/21199519599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25df1629-b2de-447d-86aa-483a0cf62ca9/69240648999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0da32c0-b9f3-47a1-9030-3019798925c0/drama_powerpoint_presentation_templates_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5181fe-59f4-49cd-b3e7-aa250ccf2b1f/digitech_gnx3_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9558fb2b-77f8-4555-a887-9425b9f11b09/46770383684.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/gcse_chemistry_acids_bases_and_salts_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5348 bytes
SHA-256: 2179ada30d68bbd1e75b55a9059d9bc1064529e71e9348854b37242c7daef785
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 12416 bytes
SHA-256: aa7f80614832de916082f7c868b95845b3d6c2158088ec913170814a9cb549d5
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16572 bytes
SHA-256: 8bf5a75161b4be50147ce6bea03af2bad48f18f15569425d3e48db004c665c15