Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4659bb9c51d5a30…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 13:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd8bc32ee5e12f34f1205f69b6421f53 SHA-1: 31a881c47df7a8a41d8fae649bd2f1c400ad375b SHA-256: e4659bb9c51d5a307d7a63e8b9c043c10b411b44ca7e430c9a60511a45a5bd74
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the link farm heuristic suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=rts+apk+mod PDF link annotation
    • http://szyuangang.com/UserFiles/file///difolizutil.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/35245543548.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/jepatomubujowerebotulijod.pdfIn PDF document text
    • http://balone.net/_upload/file///47009395934.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/16764762311.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109091750355938.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6501daaa3f8dece94720ff8c26410694/vusakejokoj.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/59532892367.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/15730272673.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/82367608667.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/11085119115.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xogisixumuxatil.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/gigadorisi.pdfIn PDF document text
    • http://z500.si/files/56161019078.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210902064829211428.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/sejiduzomipiwediju.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/jetugo.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/dedofesunivepebeki.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefe119c1c---jobupajop.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/86566443445.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/tulumovi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/71277831601.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/woxaxufatuzagupe.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_off0000cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 10216 bytes
SHA-256: c8f941c156aea79b0bcca813bb98d81caccf7dd8712aac2b37f0bdc6ba146bdd
font_01_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 20116 bytes
SHA-256: 24644b57cf018d6955ee35d208a71c11120916f2d781a087d285582d7e97d1bd

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