Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e159ee48dea3b45…

MALICIOUS

PDF

72.4 KB Created: 2021-03-22 06:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 502f5fb25a244761844247a7c961194b SHA-1: badcf6cff06571c778227db9ee8b0bfdf8c13e03 SHA-256: 8e159ee48dea3b45e60efc56f6a6dfcee82c990e819514925cac29023592ed2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://baarspo.ru/strik?utm_term=is+it+too+late+to+study+data+science', is flagged as suspicious and likely leads to a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=is+it+too+late+to+study+data+science PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ff5f68f2cf61.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/edward_said_crisis_in_orientalism.pdfIn PDF document text
    • https://bumopabir.weebly.com/uploads/1/3/4/6/134679094/lenevofokiw_mapijolovopapo_gasekejujub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_604a52cd848cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_60140597545a8.pdfIn PDF document text
    • http://rotixumuzu.22web.org/medicare_part_b_reimbursement_differential_request_form.pdfIn PDF document text
    • https://panofokolonap.weebly.com/uploads/1/3/4/4/134483377/bukigenupit_vunuja_remuxekubixe_xaxesik.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/62520233506.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/473031a23.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/tiger_rice_cooker.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/21372777040.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/32827684606.pdfIn PDF document text
    • http://vadonodip.22web.org/guzopusisugasulus.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
    • http://fidegaf.atwebpages.com/animal_farm_chapter_9_questions.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_2f5657b511654a6ca8c2e3172e7fa196.pdf?index=trueIn PDF document text
    • http://lugenizuridaj.atwebpages.com/6601510525.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_41d34d13786046aebbbeb45aa2022ca1.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_aa0fcedb8bd44fb28f6eeb2de1ea6bdb.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_4c83de92dff64996babd058561c29ca8.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_86d2ed5a51c04ecb8dc93db61eb74c65.pdf?index=trueIn 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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 4756 bytes
SHA-256: 5e8f1a84e937a629f7378562bfb8fe47e7f93de77ba230c2e1ab352f549bd3ac
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10592 bytes
SHA-256: 0fb86da9968061cc53a19f4aaea5b7e747d7cdc8848e1a55b94339b19129da6b
font_02_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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