Malicious PDF — malware analysis report

Static analysis result for SHA-256 4418ff5cfc93655e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 10:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6903d5c61f89e452264aea358f040132 SHA-1: 4c8cf291dfdbe8da9fd66f275791c3ce054f030c SHA-256: 4418ff5cfc93655ee37a7412d6376b8313c3826cb917f7a8feef0a040a880876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://111-orte.com/testarea/cwsCMSlight/media/files/56330049172.pdf In PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/170703_24844121807.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/041911533872.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88709805232.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902035729.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/juragumutidekuvalokefex.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/zatavatevareriboj.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/fakokubumifubolawepejodu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/gepuwibikaxepazuxoreg.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392bb0e74cb---19595716900.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/28474747285.pdfIn PDF document text
    • http://taociren.com/upload/file/210912012520070376wu4gle76f4wr.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/ganasewirilifazibo.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/zabiru.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/86793530570.pdfIn PDF document text
    • http://24cvety.ru/upload/files/19761540939.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nimafomupip.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/pivalefamisipu.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/rufurak.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/difewe.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/11131227466.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/29357538350.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kobuxalibegipibalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=recover+deleted+items+on+androidPDF 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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 10644 bytes
SHA-256: 446ad515344a27ec70bbe59af6b19c78cb030a25a87f8c59db47f117f215f36b
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 17472 bytes
SHA-256: a91f51299fdb882b90feb77f1e29ad629b9e6cc145373e559ff31b66dbf8aecf

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