Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a31a76c62aace10…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 08:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82e5b2cb876519fc89f8da31c3626f19 SHA-1: 95a5560aceca4d56c435ebadf405a89590ee47f6 SHA-256: 3a31a76c62aace104740ea6016c60de33942df234f5f64ad32e12eefab6e4d1d
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=hp+laserjet+pro+400+color+mfp+m475dn+toner PDF link annotation
    • http://ketezudum.22web.org/operaciones_combinadas_con_fracciones_potencias_y_races_ejercicios_resueltos.pdfIn PDF document text
    • http://zajegipu.22web.org/wifi_booster_android_app.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/dosugelademifapudavibod.pdfIn PDF document text
    • https://nepikazot.weebly.com/uploads/1/3/4/5/134526085/raxosawop-dobadekimo.pdfIn PDF document text
    • http://vijoxufomodazug.22web.org/poe_syndicate_guide_3._6.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/2ade7.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/replanteo_planimetrico_y_altimetrico.pdfIn PDF document text
    • https://zojozonamu.weebly.com/uploads/1/3/1/4/131438692/gaxinupaga.pdfIn PDF document text
    • https://kovofogigexu.weebly.com/uploads/1/3/1/8/131856149/935612f622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c818c1-14fe-48d9-b830-95476a939c06/principles_of_california_real_estate_18th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ba54d9-5e3f-4f0b-94a9-b6ae2b18c71c/69970457883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cef8116-ed9e-4eef-9dac-1631359a2ff4/vejesirixetezovivaleve.pdfIn PDF document text
    • http://fumilojejukuro.rf.gd/barbara_barry_king_sheets_costco.pdfIn PDF document text
    • http://vawolanuxoreg.epizy.com/96627998791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a1b6bb-0314-4ec5-9577-3b38d2e23c06/110cc_engine_oil_cooler_size_calculator.pdfIn PDF document text
    • http://laraduvusu.epizy.com/ambedkar_books_in_marathi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de46cfd-cae4-4f29-9ae1-0db629b9bc92/nosojigupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b5f9c4-d1c0-4b89-b2cd-3566f6bf2048/29572143346.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/83255182903.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/femur_fracture_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9aa209b-0389-4909-af6c-e3b252d4b17c/opti_manual_resistance_exercise_bike.pdfIn PDF document text
    • http://wajufuful.rf.gd/suguk.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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 5772 bytes
SHA-256: a24e3deaeb311e57d78115e1a8e553748136999d0db8356b31475807bc26660d
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 11468 bytes
SHA-256: c03a3b97786ae8ad446bfd9c380035ac41fe467921166947806d2213c1f71ea5

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