Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd90ba33740c7828…

MALICIOUS

PDF

74.7 KB Created: 2021-10-08 08:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abeffab0d393a5defa2c20bbb3b578f6 SHA-1: 442b1c5c706578d7f6679f00f169ef080653f837 SHA-256: cd90ba33740c7828fcaaa9ff622ec5fe383cd64dcb379dabcc44a213ff74c314
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://consulcongress.it/uploads/assets/file/supumit.pdf In PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/8518780982.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/botavaxetetigonuva.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/tigezerenotudowawoj.pdfIn PDF document text
    • http://teresachild.com/upload/files/73540617333.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/kapatovopalimanafowumoriz.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/20974356655.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/vazuxorudanatefarefunif.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091317085222.pdfIn PDF document text
    • http://santeh.md/img/files/7837571370.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/86734574663.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/lexevikorogemixe.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/391793518.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m40c5kkkfoe0h8pnct6e63c3l3/mepuzagufesilarovosijisij.pdfIn PDF document text
    • http://ukrfirework.com/images/file/31458227682.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/h984m7adf2393ku1a953cuppu3/35617712332.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///kavosirif.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/pananekegivofilovaf.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/72096868898.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/kuloxejujepewavokok.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/42945615677.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/10830314056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jcheater+san+andreas+download+apkPDF 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_off0000c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 10688 bytes
SHA-256: 906f435cf9fa722cd04539b4955b30ee44be5b7205209953486e5729217b9c34
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16796 bytes
SHA-256: 54bc615d1028ccd1388db33c478c91b5b5135e5368807c8085f89b01bb2be5d3

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