Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc47b43408cb9211…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfeed02db3b38793aa65155599371156 SHA-1: 35a7c2cd4a597a16db8bc6ca47f9d337cf910aff SHA-256: dc47b43408cb9211f5acdaaed9843194db1d305471752214e8c7cd39a14d2613
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. The 'SE_URGENCY_LURE' heuristic also indicates the document may contain deceptive language to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fijiembajak.com/uploads/ck_uploads/files/xisujugamububevusumupap.pdf In PDF document text
    • http://tsrmvolontari.it/userfiles/files/10700655669.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c76091ac0---72792151459.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/zafetile.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/zapavil.pdfIn PDF document text
    • http://space-edge.com/upload/files/fibamalidira.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091616261973499.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/8979214925.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilivelofupiz.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/popofa.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vidozenapazexil.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gewipovumenepevumegunifuk.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/1624984101.pdfIn PDF document text
    • https://rinducm1.com/contents/files/famugokivediluwut.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///64076245903.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/89511530173.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tozed.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/66669870237.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mixobazuwabegusojumedur.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/78087763166.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/bufikusuxumunabed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cast+desktop+to+firestickPDF 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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 10632 bytes
SHA-256: 016bc5fbc72edd5ae854d02c828fa3f115579739c21b016f1c1792f85d36a36d
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 18952 bytes
SHA-256: 7355a81292dc63795a09e84791f4025f57755ed62a7f1119ee5cc51ee93cf0f7
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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