Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc951568ac7517c7…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 10:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2f25a635652f59c3e9a550c1261824b SHA-1: 6cba256a808e07b13099a9beb95b9af7a71e460c SHA-256: fc951568ac7517c742a4a8488378079ffc0c5183271f8a6f1ece85c0ce370fea
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. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=mi+game+turbo+apk+download PDF link annotation
    • http://nagymester.com/userfiles/file/49529151774.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wexegabulemesigukelafub.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/wowivosipexiduze.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/93547473376.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/50546636505.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/rojoxuxuxitivomedijapin.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/43251801927.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/74882719183.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xujukatosul.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142990dd8175---kuvibizokozonubugosikuku.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/47404051497.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/menugisap.pdfIn PDF document text
    • http://sksound.com/userfiles/file/43162902397.pdfIn PDF document text
    • https://invision.buzyhub.com/files/66598698676.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/nunebalatuxi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219262226329014.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/50716737853.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/29159119730.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/59206709275.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631013341.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/48398741860.pdfIn PDF document text
    • http://5uempat.com/contents/files/duwinudikulurow.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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 16740 bytes
SHA-256: d1c8adc0c369b72b7320c035f59dce5b62847e44b3a14ca63857cd527843e381
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10976 bytes
SHA-256: c4fa8deb365e634465bb3404c4d9ad7f8dfde3ca50a29938f2f7bcfc5d11734c

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