Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8461aaebf39952…

MALICIOUS

PDF

76.5 KB Created: 2021-04-27 12:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d86938caccfdd51d1ccde22c1bfe2df2 SHA-1: 827e9df780b8f4f3372b337c4a858b59a4fdeae6 SHA-256: 2e8461aaebf399520adec61deacdb5f13788d9fcf767408c4e17fd343b7a5ac1
126 Risk Score

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 0.9993

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://leonvi.ru/strik?utm_term=how+much+does+international+shipping+cost+ups PDF link annotation
    • https://darurirajilubi.weebly.com/uploads/1/3/4/3/134318819/818216.pdfIn PDF document text
    • http://usacreditscore.info/gabrielle_aplin_homeuf4hs.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/latin_to_english_translation.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/tufodofitesu.pdfIn PDF document text
    • http://vekvelo.ru/75675284598wqv9c.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/estrous_cycle_in_sheep.pdfIn PDF document text
    • http://new-leggins.site/sanden_heat_pump_installation_manual_australiawbo6f.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/19453.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/afcat_syllabus_for_flying_branch.pdfIn PDF document text
    • http://fokojudup.22web.org/ryobi_hbd6ma_drill_press_manual.pdfIn PDF document text
    • http://pewujok.mypressonline.com/73988400973.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/56572962065.pdfIn PDF document text
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/levodumexenilugu.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/4803024.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/most_popular_books_of_all_time.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/tuwisupefofutibisitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/lazarillo_de_tormes_tratado_2_recursos_literarios.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/letra_del_poder_de_la_oracion.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/dowunabuzukolu.pdfIn PDF document text
    • http://nivosifif.rf.gd/nonikokedirib.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/70142735532.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5540 bytes
SHA-256: 53296b88cbcd544d8ef7ea44d4c9f6d1a3c117e9ae540f2366d6333a0beab482
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 10516 bytes
SHA-256: ec5c168df1c85d9a1a29e818713c888a7f0ed62fee8ad9a91525c66a18d17f25

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