Malicious PDF — malware analysis report

Static analysis result for SHA-256 90014640e76a90d4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 00:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c536d5508f869c52ef0b16c46031f6d6 SHA-1: b56b08f4915b7c15f95a2a6d467b969e2ff99815 SHA-256: 90014640e76a90d483a8c116e6b83a40053b4b7935fd9ca4eb5e04b1ed58f839
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to unknown domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://angkortaxiservice.com/userfiles/file/75096692766.pdf In PDF document text
    • http://geomanteia.com/userfiles/files/80698422108.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/waxonolipukolijofi.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/dederaxi.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/81321821685.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/24333302477.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/besal.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/zapejawigodiwo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/bajobaputosazubumujogavex.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/selujufasud.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/80085078628.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/88017342406.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/fuxirutuxume.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/84501749574.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/tagevupawubadomeniwejirew.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/42695989165.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/27382552920.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ac276b0744859525afdb764739f47aee/kupuwofebimon.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wubexe.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_024528.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/17259215281.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/kirixobipolurerogogorago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fun+games+to+play+outside+with+3+playersPDF 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 18264 bytes
SHA-256: 7c81afd3e9be0a09fd466ac119c5ffe787216ff463a244dd2c36b3324b3060c6
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 11288 bytes
SHA-256: 11f61f4f8a2a45f51944b5bf13fa0ebc9b7da9d72efbe49589429ffd106144bc
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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