Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e98ab9a8f2af28f…

MALICIOUS

PDF

71.8 KB Created: 2021-04-21 19:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70ced230190c9933e37d5f8a54a99787 SHA-1: 12bc1a1f36f69976a4e201ed17c9ea58f09cb0e9 SHA-256: 0e98ab9a8f2af28f2e921e29dcc544eeae2c470fb65e45403db84a6292472166
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=minna+no+nihongo+1+2nd+edition+pdf PDF link annotation
    • http://sokegex.mywebcommunity.org/que_es_un_cation_y_un_anion.pdfIn PDF document text
    • http://atomyimperial.ru/vba_code_to_encrypt_filevxjjv.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/dr._ashwani_kumar_anatomy_notes_download.pdfIn PDF document text
    • http://lishop.site/57560098912i9027.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_to_delete_facebook_account_2020_ios.pdfIn PDF document text
    • http://tehnopolis.org/plantronics_voyager_legend_uc_b235_reviewu8ksc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_6041efeb7be90.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/56380291628.pdfIn PDF document text
    • http://argo-tourism.com/the_rings_of_standing_stones_at_craigh_na_dun1fub5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_603427f26dc8d.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/anchoring_script_for_freshers_party_in_marathi.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/junoxadopedulafanolewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_603dfa79580f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_ba83ec5a4c4b4bb5a72763cef124069d.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_f770adb2140d48e0b51e83079de5dbaf.pdf?index=trueIn PDF document text
    • http://dowovefedomo.epizy.com/pidukosopakotola.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/lazitojalovof.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/business_productivity.pdfIn PDF document text
    • http://bofawujataja.epizy.com/poesias_de_fernando_pessoa_em.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/73857954658.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5188 bytes
SHA-256: 8187cfb763436654e772f5fa017d5c755b186bb4a766d8b481e06f715c8829fe
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 15404 bytes
SHA-256: c109f75b42d01ed2b271ece8e3daf8b1e17d40fa8c2af6319d918c848cc3d2ef

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