Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df1f0ebb58a2b9…

MALICIOUS

PDF

88.6 KB Created: 2021-02-23 11:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0a9ebf7b590d74f997aa15ecb16f51ed SHA-1: 5aac457acf2ec092b5dbd06c7e5b0cd80b9c7338 SHA-256: c7df1f0ebb58a2b986234f341c7cc271f1636c36566fcfe1f97fdce070f320ba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://druttle.ru/wix?keyword=mgm+dvd+opening PDF link annotation
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/nuxuzinerimalotutaze.pdfIn PDF document text
    • http://italia-doc.space/mesegarowileramisevigizw5hz.pdfIn PDF document text
    • http://golivexi.22web.org/almagesto_plataforma_ventajas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff162a9a49e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ff34db67d668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fd83570c043f.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/tepuzijifokowat_totajojeb_zonodazu_madojabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6029a6c50a064.pdfIn PDF document text
    • http://grantmedica.ru/209366131326egfz.pdfIn PDF document text
    • http://korecos.ru/2873764857asqa4.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/jezoraz.pdfIn PDF document text
    • http://albl.ru/vubuwodawesulufoxeregakatolq41.pdfIn PDF document text
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/kapixuwo_kuwim.pdfIn PDF document text
    • http://gsmall.space/chrysler_voyager_user_manual3e8gl.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
    • http://dixikigozasam.epizy.com/attack_on_titan_season_4_manga_ending_explained.pdfIn PDF document text
    • http://zajegugolex.epizy.com/lojokumuguxavosu.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_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 4536 bytes
SHA-256: 1217d1c0e8ac6bea8003a235872c7e70fed77c60beb43edac259ffaed81bd8c4
font_01_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 10240 bytes
SHA-256: 22c4d959f416803200753acc5df3689efd5cf07073f9e06c3d86deecee823874
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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