Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea5865d29c82006…

MALICIOUS

PDF

92.0 KB Created: 2021-04-24 20:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a6ab1f13bd7ec09cc541e3a60b7960df SHA-1: 558c04ceb49cca3b76271f5e12ce043a28120fa5 SHA-256: aea5865d29c82006c229f42157d2519156ce9f299f9cd987738ceb351bc01c72
126 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to 'xezojetit.ru' with a query related to 'mechanical engineering fe exam pass rate'. Heuristics indicate this is a link farm on disposable hosting, and a ML classifier flagged it as malicious. The presence of embedded URLs and the nature of the hosting suggest this PDF is used to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=mechanical+engineering+fe+exam+pass+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389793/normal_606a277d9ae18.pdfIn PDF document text
    • http://cashbackmoney.info/rexugokofeznu8c9.pdfIn PDF document text
    • http://rutamijojiru.iblogger.org/fikebe.pdfIn PDF document text
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/saxepapuw.pdfIn PDF document text
    • http://zugomujufofolum.iblogger.org/vozotezefisena.pdfIn PDF document text
    • http://reduslim-sitoufficiale.site/aws_in_actionmqeu4.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/fubuxudiladifinul8l3su.pdfIn PDF document text
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/10f581fa4e79f0.pdfIn PDF document text
    • http://lenaragiguvajir.22web.org/daliraxekusifuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5ffa346b4ae6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujavuven.epizy.com/canara_bank_account_opening_form.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/waxunurilatifugovenoli.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/tobekesemalateruxeta.pdfIn PDF document text
    • http://pikididubemet.epizy.com/48106013799.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/rainbow_fish_story_elements.pdfIn PDF document text
    • http://banobozibijur.epizy.com/diabolik_lovers_manga_espaol.pdfIn PDF document text
    • http://gaxokumixopo.epizy.com/tamozadasesi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 7660 bytes
SHA-256: c35bc16e01c0db238304c6eda4827427ed9a5c52bff5c9d06f8590919e637bd5
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 5500 bytes
SHA-256: 12d791df108d0246ab1f3fdece9d49523274556be6981103259123181391d084
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 12168 bytes
SHA-256: c837c549fe8031b5f980cdafb19685c029f5b13ec8eb108d1ad51ee6b1670fab
font_03_sfnt_off00014ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCB 16180 bytes
SHA-256: 9ec02419b796e5a33fa71cbc440792a301c31147771cc0bca5f0cd32dbb989fa

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