Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4a4bc1e1b4cd71…

MALICIOUS

PDF

79.6 KB Created: 2021-03-31 12:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 970b62de0ebc446e2a6fb4ed59d29781 SHA-1: 671511904682527d91ba0dbdf89efd7986ab5112 SHA-256: 2c4a4bc1e1b4cd712fd336cee2d9d913d29465578f30a3dc8c07eecdf715212b
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('seumenha.ru') disguised as a definition lookup. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely for SEO manipulation or to distribute various malicious payloads. Although no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence score suggest malicious intent, potentially involving JavaScript execution within the PDF to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://seumenha.ru/award?keyword=definition+of+caesarean+section+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420917/normal_603d7f8f27733.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/badolugezorilaser.pdfIn PDF document text
    • https://debarinibew.weebly.com/uploads/1/3/0/7/130775297/zamisiturujolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5ffb7411bb2b3.pdfIn PDF document text
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/1755612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000fa144493f.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/fomogot_bigewajivotijo.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/25346284673.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/07dfc361e.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/4535e7edea.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/6329596.pdfIn PDF document text
    • https://rigabobavotul.weebly.com/uploads/1/3/1/8/131856161/sinovuviredepub.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/aeac2297-96e7-450e-85ed-900b66328e47/the_importance_of_being_earnest_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/dosexuzugeroxisol.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/68115322205.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/lennox_pulse_furnace_service_manual.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/83755154769.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/daydreaming_reading_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ba4b42-be82-47b8-8162-a601d928247a/how_long_does_it_take_to_beat_the_original_final_fantasy_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74612f6-48c7-4079-afac-0a9bb7803666/change_the_given_equation_into_slope_intercept_form_ymxb._determine_the_slope_and_y-intercept.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d79cade-b518-4854-b173-0b2c3f8b38aa/57363449564.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/24716998597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aece24-9850-4f5a-a355-14c838902c2d/la_casa_de_los_espiritus_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://medlineplus.gov/cesareansection.htmlIn 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_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 5116 bytes
SHA-256: 745e9cda99fcabc07d9395af755e3e5350c803cd37afb0a24fe26b2107d1191c
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 10160 bytes
SHA-256: 86421edf44bf6147df98a03aee69f169d4758e21f9299c882c9d807a1e3d3ffb