Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab29361903365e4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 21:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2bfec1ce74e8950250c34cf56f06491 SHA-1: cdf9b629ee53df42209ef7aaa384eadda2ec7ff5 SHA-256: 3ab29361903365e4a2186012c4a2966372c93424cfa897f36af2d6857e6bc0a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan distribution vector. No scripts were extracted, but the extensive use of external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=john+wick+chapter+2+online+streaming PDF link annotation
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_730604BF343BEDFC.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/97538965738.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zisero.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/70051474101.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/seneku.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/85978520725.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b825da443aea21fbd1e878a14113747d/kelimolivugari.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/wigemikasenajeduluvi.pdfIn PDF document text
    • http://topp.pl/_topp/file/83826642529.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zoxobizaxezofarijejejeji.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912012445.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/tivavifetekopuxuzikepad.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/6932135307.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/54252287026.pdfIn PDF document text
    • http://kite-surf.sk/files/99448950149.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/fiwebelere.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/63803890314.pdfIn PDF document text
    • http://hkwwta.org/userfiles/wivukoxukilujorodetive.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/pegezoxukatixuwamovu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kifumu.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/buraf.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abc8f1ef4df9c399c2507ca691815be4/65653731457.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/lifetilurubiruvexez.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 11112 bytes
SHA-256: 457e141d65e5b2fcf59fedcf3e59f7ed1454a70db5256a4a249604d13b9d3d31
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 17188 bytes
SHA-256: fd2e6b7ad195baf040d09ec6003897f7e07082f27b1d09a253558220e9484cd6
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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