Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13c76caa2b0abec…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 12:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2651fc9be4175848f73f1cacfa5eb842 SHA-1: 27a82e04ac59b6ab263a754a034462d433b960c3 SHA-256: e13c76caa2b0abec4f31532b0c0eb8b83a0af89a0dd5cb20310f8cebb5ecc956
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ringid.vn/ckfinder/userfiles/files/90087724563.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/jotimekumozotadututusu.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///polojaruke.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/besutetuzesofekup.pdfIn PDF document text
    • http://mobitransjogja.com/files/29562079606.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ronusuropiwif.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/lovenusafe.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/67280529849.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5e4965b---fojikebazukonipuzenugoja.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/zaziwokonimi.pdfIn PDF document text
    • http://master-br.ru/img/file/52977798273.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/junaburutebupijukogilize.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zaxiwovapetasutofazo.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/88291129763.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/wazojamepu.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/felubi.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pufisonalupa.pdfIn PDF document text
    • http://vejwun.cz/images/58212858559.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907190901226708.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viliniwujusud.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb54bd0407---98595624772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=puffin+apk+pcPDF 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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 17196 bytes
SHA-256: f7cfc4b66884bbfb475772a509bd7ae3ddbf9b6fc7e904258f590cf8159b3f2f
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 10000 bytes
SHA-256: 5ef74927c845872a8a7bce649b00c59f9ee585f57c53b7b2700fcb31ab5a5f8a
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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