Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d97de939710f864…

MALICIOUS

PDF

68.1 KB Created: 2021-10-12 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f775685c8985a1ba6958c2ecb6f30ca SHA-1: fca4d254f380cfe60ed4a1e320461115d2ef9afc SHA-256: 2d97de939710f864c9ef98a09e499df5c01885fe616c9a292c1c9af110e03564
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear disposable. This suggests the primary purpose is to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cka-shiba.com/ckfinder/userfiles/files/17552953012.pdf In PDF document text
    • http://khiensa.com/UserFiles/File/bikasupuzetipoxer.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/bibimazesusowiwu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0258b75b1---52095598776.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/13775316468.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/78947727509.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109190154029023.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/96481261624.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/15100524377.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/xivetexito.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/karipujin.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zomulol.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc222af944---46795466360.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/38219825072.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/jarugaxubotuxofi.pdfIn PDF document text
    • http://azizolace.cz/images/file/sejixelepogusaferipojilem.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/moduvuwovadegobaworomaduj.pdfIn PDF document text
    • https://porfic.com/fotos/file/bufekipuzibavejoso.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/62642078598.pdfIn PDF document text
    • http://3m18.com/images/editor/files/6811584077.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/degagazetam.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=ac+condenser+unit+blowing+cold+air+outsidePDF 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_off0000ae85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 14256 bytes
SHA-256: 5c03dbaa8be418e1febcd357a25fc93a7d0e9812a91ae7fe1b84b6cdd0a59304
font_01_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 10852 bytes
SHA-256: af8669706bc786815e203e82f4686a3e50a456b103006fce96b645c7d074d389
font_02_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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