Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91508a6d992c476…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d9a1676e6765804c9a3fc776c3aab1d6 SHA-1: 4078fb93f9bcf3f8aac1bcbd5f353e2590e82e4a SHA-256: e91508a6d992c47624ccb640955ae1aea0c1792e49a0c609b25716a04ef2c32d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.colline-eternelle.com/ckfinder/userfiles/files/42646417713.pdf In PDF document text
    • http://babyindex.nl/images/uploads/rujopob.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/jasit.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/9695507952.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tulow.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/wajowagasexu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f010455aef---wasufejenojozaxolajo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sozirekobodinugaxaban.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/15175175644.pdfIn PDF document text
    • https://festacontinua.it/public/file/11951379684.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/vubegokotunapuluwite.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/94328262037.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/ranulixige.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210904_89C244DA295A48C3.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/wevinokovirofokewowabadu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/33510534502.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/32518252102.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/69466746363.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/noxodapunasurewuvafow.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/jazobumunu.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/96540758532.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/toravurawusaluvokig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+move+everything+from+iphone+to+androidPDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 17192 bytes
SHA-256: d063b2f66e62bcf8ebb5f3580097f2cfd4da2c8a1b761521adba121034060fac
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10988 bytes
SHA-256: 01ad1e26f423ede96d410e806aaec9636f38a641ef146ec34cc6c4ec8056eeb3
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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