Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ab87db9e8e73f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 14:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d00cefc12c4a5dde8b834b75a8a3a4e SHA-1: 5f992c0ef4024f0367e0a977d8011179a355006b SHA-256: f42ab87db9e8e73f2af0b9a5974cbbfca6e24cda2a0466fdc0113bae45ba8424
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=fundamentals+of+microelectronics+behzad+razavi+2nd+edition+pdf+download PDF link annotation
    • https://cdn.sqhk.co/nefakovuwot/NkTINgj/13213920168.pdfIn PDF document text
    • http://dronextactical.xyz/corporate_governance_framework_template_ukjre35.pdfIn PDF document text
    • http://shimano-stradic.ru/xoxogovixijusosenow4page.pdfIn PDF document text
    • http://timinome.getenjoyment.net/theological_foundation_of_christian_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_601dc58ee25df.pdfIn PDF document text
    • http://mebets.xyz/32146938994mmsfn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_603cbdb78a1b2.pdfIn PDF document text
    • http://piredvizhnik.com/42998590323kqaob.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/hgiYjdh/marco_s_pizza_nutrition_cauliflower_crust.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/hYhjbuo/69928567385.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/labujubilakemknfjw.pdfIn PDF document text
    • http://copyrightprivacy.site/drug_store_and_business_management_book19gpt.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/793560356871mwcs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ffdfdae16356.pdfIn PDF document text
    • http://itfamily.info/lagesogiforodpr7.pdfIn PDF document text
    • http://casserlabs.xyz/32383972528fsm2.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/algorithm_design_and_applications_goodrich_solutions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fcb3a834fcb3.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/Rhggihj/bream_lure_fishing_at_night.pdfIn PDF document text
    • http://groby-ritual.online/descargar_winrar_portable_windows_10v61hg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/atharva_veda_in_bengali_download.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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5824 bytes
SHA-256: 02d337a3a9d68cf38ccfc2e078d381f0cb8f906a5fc8b1fdefdac2dc977d50e2
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10776 bytes
SHA-256: 5740c1c4505cbb0a60de049c57fefe87a2b5fbcd7ecfb505c13192132c14fcdf

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