Malicious PDF — malware analysis report

Static analysis result for SHA-256 959e15129ff79aaa…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 22:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1afa38306a712d6d6cf408c586dbcb00 SHA-1: 131149891e067f44b520bf5be0debeb4acc0203c SHA-256: 959e15129ff79aaa3627f8c552a45f2bfebc0142011f6a0fa9bf056988078abe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

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://queure.ru/uplcv?utm_term=android+full+games+download PDF link annotation
    • https://movie2book.com/userfiles/file/8260214565.pdfIn PDF document text
    • http://gaudi.tw/upload/file/71339938710.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/26991413823.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wedisodovuwawiwotunibi.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://hoachattn.com/image/files/47704589029.pdfIn PDF document text
    • http://wamer.org/userfiles/file/23344357284.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/bivuwisigidepo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6c7f7or0dd025sob7fc4p3cq0/53189248995.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/tiropowupisojilaribifuri.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/96320299864.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/5090757513.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/29095458740.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/suxarisorubobovimarobaliw.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/28200434547.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/wusikin.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xawakevibolavuf.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gonozime.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca811ba55---minegonak.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/81891912634.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/32481440728.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/favaniduw.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/binugo.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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15216 bytes
SHA-256: af44f78147bd158b0a6c08e99ca53eaaa78d8a9cef94a7e77d90a22a7b289a45
font_02_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10764 bytes
SHA-256: 71a88532a51cd50c3333ba4fc3c1c87615983ea468c64ed9cd454a60d3ceee16

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