Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1649e152ced187…

MALICIOUS

PDF

73.2 KB Created: 2021-06-08 19:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 991b790358d1dd118951c5c12e5616c6 SHA-1: b6b4dd40e6b82c599376e3822f1332cb18a6a031 SHA-256: ff1649e152ced1870355da41c293672acd15c3dec0bb0e8ddcf15fc85057741d
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 0.9997

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://medvor.ru/pbw?utm_term=minecraft+java+edition+for+windows+7 PDF link annotation
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/9951528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fdc522dc72fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_5fe911350d91b.pdfIn PDF document text
    • https://pugoterofox.weebly.com/uploads/1/3/4/6/134608128/2679945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_600ebce545822.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/f8cae1a846.pdfIn PDF document text
    • https://penadijuzebi.weebly.com/uploads/1/3/5/3/135310947/bodot-datasigejoje.pdfIn PDF document text
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/73c24a274d7d4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_60447411b59f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6061814dd2121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_5fe27c80b4fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd660a87d735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_606a0a066f3f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_5fcb6caa18bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_603aca86625a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144460623/14965057632.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144836451/reach_declaration_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e869919c-df72-4d22-a83d-5caa4c6ff85b/33802385211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bf20e2-f94f-49a9-8c33-377935209983/punufumiposeritunuk.pdfIn PDF document text
    • http://fafevupu.pbworks.com/f/york_maxe_centrifugal_chiller_service_manual.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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 5296 bytes
SHA-256: f26ad6b50dfb69fe005c986e03236c52a4dad97e7caad2e8958ccf2271a72f75
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 11752 bytes
SHA-256: 30cc3c0f77ac4321cd125ac45eb85c497cd32bf769bd7963d6324a33084886d2

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