Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deef4f4266664e0…

MALICIOUS

PDF

75.6 KB Created: 2021-05-24 13:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b80fcea462dd19032572143fe9f210c0 SHA-1: 75db6ac1a006a032d4ed2cfa8b9b63dbc1086094 SHA-256: 3deef4f4266664e007c6378b20b632242a896252887ac8cce8dc6c5e2d166c1e
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=como+recargar+diamantes+en+free+fire+sin+pagostore PDF link annotation
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/lozeme_bolavuvi_tutigokesatu_fifomaj.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/2fffbb.pdfIn PDF document text
    • https://duweliga.weebly.com/uploads/1/3/4/5/134593675/9699419.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/gunuwogawapemenavev.pdfIn PDF document text
    • https://femasubukodulis.weebly.com/uploads/1/3/4/4/134489748/5841758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5fd178dcb387f.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/gixef.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/90e25bf696b64.pdfIn PDF document text
    • https://lupabarudu.weebly.com/uploads/1/3/1/3/131398308/d96466.pdfIn PDF document text
    • https://bipawekiramobaz.weebly.com/uploads/1/3/5/3/135325031/a3b3a4c9c2355e.pdfIn PDF document text
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/84c7a6a0ac22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_601aa1140d8e8.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/9562116.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/8045429.pdfIn PDF document text
    • https://pebenari.weebly.com/uploads/1/3/4/5/134518206/nanunawovaper.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/warikovi.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/resixexi/phrasal_verbs_with_come.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/electrochemistry_questions_and_answers.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5348 bytes
SHA-256: e43b3cfee2a6ed0e3aa6a65c9d065210c05ca069dd8b8e506a640e397ccf8a7c
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 12176 bytes
SHA-256: 65df460054fefd71207a6dea1448ddb86067921225690df2f3ebdcda774efa96

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