Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f71e0a2924a947c…

MALICIOUS

PDF

72.2 KB Created: 2021-05-31 20:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec7b2a70d9725d8f30e3115b86238eff SHA-1: 1a6b2e7b1d863021cd1d662d033c0de6fc24b032 SHA-256: 9f71e0a2924a947c23a123214569c97b34bd17e60e3e8883b6105a04bd93fdbd
234 Risk Score

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. It uses a password-protected-archive lure. 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 0.9998

Heuristics 8

  • 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.
  • 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://synerhu.ru/pbw?utm_term=how+to+pair+a+logitech+keyboard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470380/normal_601b6c5b1641f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_60268af44f9b2.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/57e712716f07039.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366311/normal_60b2731377d0d.pdfIn PDF document text
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/6678057.pdfIn PDF document text
    • https://vagaletufuwowi.weebly.com/uploads/1/3/2/6/132681464/1336114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_605f5ee045a08.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/roxozemibib_buribiniw_dofasafatega_rojovuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekivuxuga.pbworks.com/f/watch_free_full_movies_no_sign_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f680000-488b-42ae-a6f8-0bef9b8675ca/cant_find_hawkwood_summon_sign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ac9dcb-e205-4fbe-a23f-7e5224f82dd3/texokemaseboro.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422319/3899302553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b7ec95-2074-444c-8647-fe48ec0f253f/precauciones_de_administracion_de_medicamentos_por_via_intradermica.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413223/mesupinimakebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a540ad62-858a-4423-a2af-eecd193d2f45/literary_criticism_online_course.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144413793/ravpower_filehub_password_change.pdfIn PDF document text
    • http://pozapagula.pbworks.com/w/file/fetch/144417504/fuvofugosatovewu.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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 5516 bytes
SHA-256: e6459f2dd21b6d2725dd64b0667b1c8421b31d9d80d4b6e1f776381e0edad25c
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 10896 bytes
SHA-256: a159e5527537a34aaced71542aa3867b907588e3ddfc0335b9260652556f857f