Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21f7064f49ce11…

MALICIOUS

PDF

79.0 KB Created: 2020-11-14 16:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f190d2be8f8925c9b4eed930a43b9a65 SHA-1: cbf35b291fd0a9507b041771ebeaa88d5a2e3b8b SHA-256: db21f7064f49ce113406fe44b9e5d341c57606511128bd2afaa8b62e7a84033f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a mass of external links, and also a PDF_URI pointing to a suspicious domain. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?utm_term=novena+prayer+for+the+dead PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fa0ef93ba906.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/menuxokezopamif-kazadud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f8a51120a314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f97d46f413bb.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/wofujanajatizasos.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.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/sabegokek/12939801110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5a39cd-f0aa-4079-9cae-d84c87d5fdba/musubomiwabakarimafirize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0db09c-157e-43a4-ba05-3ca19a201858/judopakiturujewidodof.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/favagew.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/from_old_public_administration_to_new_public_management.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/recursive_equation_worksheet.pdfIn 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_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 5052 bytes
SHA-256: 1c6ce8ad1fb391927cb4c7ed7073936d1f268abfc3607f19144241aef54cee48
font_01_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 11360 bytes
SHA-256: fd2a56a773746c013ba53699bff49fe17336eae77e09dc0eb836762a6cbff8fe

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