Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b155b4e7acc5b40…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 00:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 699006c3eb5b8796ee9c78083af5f4f3 SHA-1: 930c7d35482e7e31abab211888f4e6a4a4f7cfb0 SHA-256: 9b155b4e7acc5b40fca45a501141c63548e13bcbcb790f45680fef8fa59ab575
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or link farm operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF as a link farm on disposable hosting, reinforcing the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=primer+celular+con+android PDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/pekawagalid.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/zadewemodamevizoz.pdfIn PDF document text
    • http://expresskaliski.info/file/42271919699.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/kuguz.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/1058539742.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/bekepofegodobofojiju.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/93837138827.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/mapuribulapewak.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bisavam.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/88811253368.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/tukidadoxet.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/naberufusirawumaxi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f939ccfa0c7edd6d80109d35c5462980/fulilutu.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/78391253778.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109112133226263.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xivexubomogexiganuzor.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/jabokilizax.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/49379274120.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109140912578608.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109102229043919.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/jipikesosavododog.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/24437547773.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/54409800524.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_off0000c04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04C 17744 bytes
SHA-256: 872d64a7e524cb50b56184f30a723093a31df0fd77e5835e4c69624dd20a558a
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10368 bytes
SHA-256: e4373b5834f006eb4471c4f2097aca84f1a36fc3a5cc9bc15233d2974ba5a62c
font_02_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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