Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f657b0f24ac06a7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 05:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0666f9c544d81b60b617d749a507a84 SHA-1: 7296325fcb4770c7641bdc62c3ace6786cb8134c SHA-256: 4f657b0f24ac06a7c15e6c68f69cbd9eb84495051ee8fc8b7eed19ddf0d4c6d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts to obscure the true malicious intent. The presence of external URIs suggests the document is intended to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.lipca.com/ckfinder/userfiles/files/15369389851.pdf In PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/kigetutefodoxekadaru.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908205948.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jazevopazaxugutatogi.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zasivenanura.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_DEDAC41471F8336A.pdfIn PDF document text
    • https://o-dance.com/upload/files/5167390460.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/17033364711.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/dariv.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/10505297917.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kefafezagozelukumobikodum.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/66436248089.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210914120031.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/13317791267.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/zuxunenisogadifog.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/lafixabijapukojapumetiz.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/97109771717.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210831182136.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/69279612630.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912062814.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xigulevufewulupobuf.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tevoruboruvaxupal.pdfIn PDF document text
    • http://harlit.com/upfiles/file/pogowixepedinefenozosafug.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/murufefif.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92442234886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+slow+motion+video+in+androidPDF link annotation
    • 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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 10644 bytes
SHA-256: 2358f926e488bf715eecdc880c186c5d3dc8eb48952ed09ea9f55327fe97e4c9
font_02_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16976 bytes
SHA-256: f9c556dd348d115a9b517ddd212139f702503b757e4814ba784b40a9283b1771

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