Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9e68be8a84f5bf…

MALICIOUS

PDF

88.4 KB Created: 2021-03-28 15:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c463d931fb68ac05ab0a7c5946c5e0b SHA-1: 158703ca3e45812887d524c143f8c2ebb9076a5d SHA-256: fc9e68be8a84f5bfe630626cf33033880ead381b22809e2b161ffa270b81ed47
226 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. 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 0.9996

Heuristics 7

  • 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.
  • 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://fokemale.ru/award?keyword=orari+metro+cassina+de+pecchi+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fcf3dbe30a9e.pdfIn PDF document text
    • https://nofuwotepilob.weebly.com/uploads/1/3/1/6/131636733/8932488.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/tebugis.pdfIn PDF document text
    • https://zuxomizo.weebly.com/uploads/1/3/2/7/132710603/mufarisobivute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fdd6cf37808a.pdfIn PDF document text
    • http://pojakepe.22web.org/47488125478.pdfIn PDF document text
    • https://xinotojopafexiz.weebly.com/uploads/1/3/4/3/134316842/laruriramewebinogati.pdfIn PDF document text
    • http://nawoxir.22web.org/download_manga_tales_of_demons_and_gods_sub_indo.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/9311446.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/prepare_and_produce_bakery_products.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/5638392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_60148bd3a76dc.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/657877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6013bf413a064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_600de728c87e7.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/folupibaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2734b352-4171-44c6-bb5a-5cc3edd2c1fd/tovejixasatida.pdfIn PDF document text
    • http://kugovede.epizy.com/fizaxaver.pdfIn PDF document text
    • http://panuvan.rf.gd/86345380639.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/25130635051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaafd93-6368-42db-add1-5776b2ca9987/boatswain_mate_second_class_salary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 5176 bytes
SHA-256: f0576fa0954b715b9ac388364c5d778aa183f3edb8be96fc2d248199dad7032d
font_01_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 12764 bytes
SHA-256: 77a488f1dcefed38c131994c8e674820c0a618c43fc9d14dc0ff08c5b487bdf3
font_02_sfnt_off0001447e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2