Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4f73eae17277e6…

MALICIOUS

PDF

79.6 KB Created: 2021-04-09 01:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c47fdd77dad313588f5c7e9d358a6ca1 SHA-1: c409ba82a23e6631328effb7e4e40c9c82e2d83b SHA-256: 5d4f73eae17277e6b96ea6010e217629e0a5c5ef69ddb5a73b56b6875669cb0b
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=how+to+use+my+little+steamer+mini PDF link annotation
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/80355.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/wajupeliru.pdfIn PDF document text
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/436db4.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/ca91806a9ee.pdfIn PDF document text
    • http://sevastopol.sale/pomikaderekinelaxulosose01k0l.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/fejobud.pdfIn PDF document text
    • https://junetowumudi.weebly.com/uploads/1/3/4/5/134506976/8203074.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/8508392.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/zisijopexorux-gowipofaraxose-denovovivekepet-dagejijamiv.pdfIn PDF document text
    • http://afracheat2.xyz/vuviwasalezatilulixux5wmp7.pdfIn PDF document text
    • http://phillipen.online/tafexaslqyv.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/luritopu-fojomepivesafi.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/81f6cd61-aa44-406a-a66c-9738629a9103/pedajitafogifalono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750eb186-1f1b-46f4-9b86-72429497d54b/la_historia_del_marques_de_sade_pelicula.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/lijurikimoloda.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/astro_boy_omega_factor_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ba914f-96ba-4bb0-aff9-5ec88c199345/linksys_wrt120n_firmware_dd-wrt.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/bapuwojovapujesapojiwenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d9a31e-b1e9-44ad-88ed-7266b7f40a56/58324764243.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/doncaster_free_press_court_report_september_2019.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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 4984 bytes
SHA-256: f6d5cc47981e36bb82f1f3035eb95b6ffd042edd2c2dfe50efd42b973593801a
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 10564 bytes
SHA-256: 89e77aa22e46ac3ac4e94d6f6fe622b243c42807d0d19c894b275b535cef3bf2

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