Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac090b0ad3e2883e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 09:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d968e6a4aac283968001da0188f471a7 SHA-1: 7c17748933f134ef99e05d546603411580621a1a SHA-256: ac090b0ad3e2883e728b99d8dc78dfde3b76f7d8c7ab8497b7e706dcb4397b3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kbautotech.com/board/datafiles/imagefile/85354090861.pdf In PDF document text
    • http://wernitznigg.at/files/91862325198.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/13086952424.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/41826916739.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/bimawepitokuvetupusaletu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/4982924797.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/laxupe.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/kixirowoligitawumatu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gn3strtc7clg4gig3oviftkbg0/fixubukoz.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/13149527826.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zafozibip.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/maduxajeta.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/lijozezogosinikesavo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85746e14d---21326777340.pdfIn PDF document text
    • http://inica.org/files/file///tulejazav.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-6/20210906015021864075.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/87355473957.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/94795102954.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/83646032641.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kitalezumapajuf.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/19134966879.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/lumofunemabudavoku.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/27018426941.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/13306270146.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/42773649475.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/bavavuzowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chapter+7+bhagavad+gita+pdfPDF 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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 17620 bytes
SHA-256: cb039b3a83879e83f30bd5e6a775d973a6f81d4bbfdaa042eab62159aa1fa4e6
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 10628 bytes
SHA-256: b0827cc3b5a1eac880dd450f34d890147b255daca49ae2a5b59f98924afacfc4