Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ecc529c0c05af3…

MALICIOUS

PDF

89.3 KB Created: 2020-11-14 16:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 98e2e58491f9f6d5942dec62b7169cc3 SHA-1: 90fe29fd77b0951b14d33c39b6ab0ed72e6f267d SHA-256: b4ecc529c0c05af37c63ef0bd47d2ec9d96cf5a50498f9a3fa7c9b8065ce015d
156 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 0.9998

Heuristics 5

  • 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
  • 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://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://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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

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
font_02_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 18148 bytes
SHA-256: aaa4f0b4422aff759a8364142bb93eec046a35f3ab7cf28fe1e90df516b1e325

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