Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e9b6ba6676d1b6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-23 07:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac36c2fc4098780b68d8077e95c1d82f SHA-1: 8a69cd4164b2a30168588020d27887927a2cffc7 SHA-256: 72e9b6ba6676d1b6a044ebb0fcc4790723198edc24ebedd36f011a115aa1c065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly suggest an attack pattern involving the exploitation of user trust to lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vidaleve.net/ckfinder/userfiles/files/roduwubi.pdf In PDF document text
    • https://njshore.drinkpoint.com/uploads/files/pedegaxikutugotiguretige.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/18893582663.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/91651968489.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/79796352300.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/3659392951.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/96142492681.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fomekeg.pdfIn PDF document text
    • http://webs.eusko-ikaskuntza.org/files/galeria/files/30453010986.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/3814988165.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/malenoravorasesapekujep.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/20912298637.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/buwidunirurigiri.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0tvooevcqa93g7jijdld826m54/molasotikepisewi.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/46955356227.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1422f2c0---22869031611.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/xifitoja.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nibolimuzorutuxalo.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/52562285978.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/gukotezi.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/97978796286.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/nubugewuwibodalekizufelu.pdfIn PDF document text
    • http://hzqzg.com/d/files/83071064655.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/titarowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=khan+tv+crictimePDF 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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 10216 bytes
SHA-256: 9919a39e755d23af8a1749837baac5f8f007555bc19e2b6c471d532682693c61
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 15456 bytes
SHA-256: 3fea357f0f00803b9f95c1fa1c059993997465ce4c3e6befb1e5dfef3417e70d