Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca56175eff2c57ba…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 18:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 94c20ac0f1fbc6caab2475fababe95cd SHA-1: 2ae05ca1f210ab3c6fc6f3cdb1213e5de7ff1452 SHA-256: ca56175eff2c57ba770254fa2b07a148c35923b301eff0f38552ba3cc97d471b
126 Risk Score

Malware Insights

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

This PDF document 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 PDF structure and extensive external linking suggest it is designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=everyday%20use%20short%20story%20setting PDF link annotation
    • http://tanitebose.22web.org/61957167662.pdfIn PDF document text
    • http://juxeribitu.iblogger.org/68911166250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fec132250a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_601baca3bdc08.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/vegoxez.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/9504707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_6035222966f7b.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/87578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketugida.rf.gd/april_calendar_template_2019_word.pdfIn PDF document text
    • http://jazoxuxorilule.epizy.com/pugep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb18682-2ddc-4300-8ba6-7817c2f039ba/who_sings_christine_in_the_phantom_of_the_opera_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08b14b9-90cf-475a-8a14-3732cde71508/tovojuxaseluvusopezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3322f5e4-45db-43ac-8771-e00ac4e752de/lagobuzebutazapuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f22f27-1786-4419-b2bb-9673e1360abf/when_communicating_across_cultures_the_best_strategy_regarding_language_use_is_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee85ba3-a003-4341-8aad-d287c6e7f19c/how_to_analysis_data_in_excel_2010.pdfIn PDF document text
    • http://fokexup.rf.gd/47590305996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dac23cb-db2d-4a13-bfd6-fe518586bbaa/vector_mechanics_for_engineers_statics_and_dynamics_10th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0008244-58dc-4180-bc70-0f0c2cc647f1/how_to_fix_printer_is_offline_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a4ee1a-8a35-4d1d-a709-d6e280796c31/dogoburujubad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6278eee5-f14f-4e06-a051-ae485dcfb27b/majazapewawonirutatok.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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5176 bytes
SHA-256: 2d7ee52bbdb54fcb433ff0383ccc3b6ced869f772e22c15a92755d20683a6aa7
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 11224 bytes
SHA-256: 8575ce9a929807118937eebfd50cb2ea73668555504bab044dbe965575317627