Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebbafee8d0d785d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 02:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 01b1e6be7ee489d0f5d4b54c9ea3f089 SHA-1: a5e0379d2b866a1ed130607e59cf6a42c24e454e SHA-256: 4ebbafee8d0d785d62069ec097b54b452a6dc03c12637bc8f7e530f954f4b914
126 Risk Score

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 0.9955

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://medvor.ru/uplcv?utm_term=justice+league+dark+apokolips+full+movie PDF link annotation
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • http://synowka.pl/galeria/file/9252123051.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xefusumufubafebilepa.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/6730457625.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/mepelevi.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/44046051865.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/66474471549.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/ruwiguwapapev.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/10110036965.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/73725162161.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/84281828594.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/73242740840.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/10319492249.pdfIn PDF document text
    • http://poultech.net/d/files/33083695204.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61219788332.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/46275939814.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/21439841618.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/76219850293.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630957758.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/venebowipobamabuzade.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/48466863581.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9459833892.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/rasajifikejotokinoz.pdfIn PDF document text
    • https://birotex.rs/images/files/masirijetifaluv.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://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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 17592 bytes
SHA-256: 355987aca71b32c0dfd1a59e0ee1759e6207ecf6aea1c3d2e0b258710cd97dc7
font_01_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 11108 bytes
SHA-256: 193dff39e5eecac524e23a212ff48abd1f0f653cc2deb4dcf1216e51819f3f13
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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