Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b1880632fb42e1…

MALICIOUS

PDF

81.0 KB Created: 2021-03-22 02:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00f63d27eab1c9da0036134dfc341318 SHA-1: 81dfe82ba003dfdb70d7d13baf6d583ec74f8bae SHA-256: f6b1880632fb42e18d66ea9f15e800a1f86192d8a4b0dc6fd29ade2f507cf832
186 Risk Score

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 0.9993

Heuristics 6

  • 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 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://xajibur.ru/wix?keyword=high+schools+in+lafayette+la PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426277/normal_5ff38f592009a.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/vofapotozoreti-pogapawex-mogogim-xekaso.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/3008541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_60072841bbdc3.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/liluditi.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/pijowizoda.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/jogib.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/1808694.pdfIn PDF document text
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/cc29d459d39b31b.pdfIn PDF document text
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/xitisuli_kokivozakule.pdfIn PDF document text
    • https://gixoloxivut.weebly.com/uploads/1/3/4/0/134040336/wogewolede.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/kerakelon_wewoz.pdfIn PDF document text
    • https://pekosorevonoxa.weebly.com/uploads/1/3/0/7/130739373/e36c9.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/be5fe38cc1ef7d.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/kumikukedodik.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/8452506.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/rofesiwilufaxuwa.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/156225.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/6225808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_602c06db2bc39.pdfIn PDF document text
    • https://latobebesat.weebly.com/uploads/1/3/5/9/135993630/70727.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/lekelepowo/bowawedixewuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/overtime_pay_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/sword_art_online_gameplay_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/sonic_nutrition_breakfast_burrito.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_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 5112 bytes
SHA-256: 2d644b3105042b555570d5f3ddf3e16fa8b447e12a01d27be1f6662a50ebef44
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 10800 bytes
SHA-256: a5b3a64e5ac5f39c9f02e2fff0c8d6796a6c1e408970f6bff327e371ae29b387