Malicious PDF — malware analysis report

Static analysis result for SHA-256 a747c991b4c2a7cf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b253ec66b845b84bc7cb4cf72f9b4b4 SHA-1: 299844c886fb6ccb85aa4607000428c3efa32c2f SHA-256: a747c991b4c2a7cf964eb1dc689b6b20249861e596f3bad38ac3dc345ec8ac6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=a+maj7+chord PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2ee84bf06c95cb2be94f52ca130a1775/86763952059.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210918_61F6F81E13824166.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/31160557451.pdfIn PDF document text
    • https://alohasafaris.com/files/78671356825.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80435742398.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/10439484584.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/86806037192.pdfIn PDF document text
    • http://regmac.net/userfiles/files/14934894943.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fuzavoka.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixipuwulidusiwawa.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/45504589733.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/35035769454.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a8262b57a---masogizokosanelabigun.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/kedonewavebeligujinesem.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wogagimekasole.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091521574685.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/jawud.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/16543430206.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suraraperumejalu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/2589467701.pdfIn PDF document text
    • https://insp.biz/img/file/89239874799.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/65842109560.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210911_34EC5ABC0CB23081.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/lulixi.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_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 10156 bytes
SHA-256: 7d972c02d73872dfa05844525842e757988df2f6d498dccc400fa2a310cac444
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 19672 bytes
SHA-256: 5810ac3bd155365b4e7f760dde15aad5fc0a09cf6eaedead57992d89a942c928

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