Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f1b8498509ad10…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 11:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c093a14c76cb3f224da78dc5cb7c004 SHA-1: 15547776387084ae855deac830da04af04b00d4e SHA-256: 37f1b8498509ad10d1b0cb617e7985bdb2f2c7a7b4bd2ae63d1758be991807fa
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 0.9993

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://baarspo.ru/strik?utm_term=us+army+reserve PDF link annotation
    • http://form-lnstagramcopyrightservices.com/8535163842oatwg.pdfIn PDF document text
    • http://hookup756.fun/734104754753uh8m.pdfIn PDF document text
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/padefozunigik_tiluzud.pdfIn PDF document text
    • http://heliusdesign.ru/hill_manufacturing_sds_sheetsr9f7k.pdfIn PDF document text
    • http://letnesil.xyz/24939802442dnxak.pdfIn PDF document text
    • http://desokore.medianewsonline.com/8918805237.pdfIn PDF document text
    • http://themarkuzmusic.com/kofobikuwanasutizabosw60c5.pdfIn PDF document text
    • http://onesmall.space/4152408842412il2.pdfIn PDF document text
    • http://mixed-rootwork.com/kesotumaxomowubewx5l.pdfIn PDF document text
    • http://probkin34.xyz/how_to_reset_a_viper_alarmcfxbz.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/flowers_for_algernon_chapter_11_summary.pdfIn PDF document text
    • https://rekakugiraki.weebly.com/uploads/1/3/4/6/134623504/xojajeta-wivasomew.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/vukevupuxolivat.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/50803381150.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/d96344219d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebotavafusu.epizy.com/lewus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12bec47-0c30-459c-8716-0af692bc022a/how_to_start_off_a_freestyle_rap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b432a883-17a1-4bf6-9c51-1f3b5995400d/primer_curso_de_contabilidad_elias_lara_flores_gratis.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/dagup.pdfIn PDF document text
    • http://favigagiwu.epizy.com/xabedopovotagasidisiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef1d022-3d71-4648-8b6c-dabc6f7aaaae/what_is_religious_tolerance_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e127bfb-c4c2-4c85-b1d5-1bdbc8aa0b75/how_much_is_after_effects_cc_2020.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/28697330715.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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 4952 bytes
SHA-256: 9767de5e5af8c64d2fd58051e0d3578aaae93465dc66e54c06674b29404e4c2e
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10764 bytes
SHA-256: 57d670d964f6a83bdf2de91a8a7162bb21627ed676bcf77fee058a9c6e4691a0

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