Malicious PDF — malware analysis report

Static analysis result for SHA-256 815631cbe216b353…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 17:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4346b3234a956952be1ffeda94f2f837 SHA-1: 27ae6c3e809313d5953ed1ace24a7ccc5d3aab1c SHA-256: 815631cbe216b353d43dbbce54856ac3aae519588cda58e42d19ff71dccf4444
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 trojan distribution. The presence of numerous embedded URLs, many pointing to file download paths on various domains, suggests an attempt to host and distribute malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a network of links for deceptive purposes, likely to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.satunatc.ac.th/ckfinder/userfiles/files/78750962996.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/92732021107.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/gumadaxigonuzenakakurugu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613846bc8a6d9---54530525182.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/22443409769.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/68095579816.pdfIn PDF document text
    • http://contelex.it/userfiles/files/83604828011.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/46824479859.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/57868408089.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/83624015808.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/penezudubosu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/mezolikuboxi.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/89975658340.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/rukopolejunesin.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/87323875592.pdfIn PDF document text
    • http://labradory.pl/file/kesetuguxetuk.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92143607195.pdfIn PDF document text
    • http://birdwatching.sk/media/file/mugenexamapifinivunoj.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/27600431451.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/ranajunudedepigok.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/65325159773.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/40978784476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+ps4+emulatorPDF 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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 17600 bytes
SHA-256: 83eaec117fc21df7a2f7f87a14fd67b022284d0a963da48e0ef0e13596e76b91
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 10724 bytes
SHA-256: 745db71bc287d1d3fe2d9c0c106cf272839c44ea6e0db5a474c960a451c6df1e

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