Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e6e8d1697e6336…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 13:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12cf0e8fc8650d5eb1ef24519e413bf1 SHA-1: 80960ca4607ce35cd12edfc92ceb16ee73c588b0 SHA-256: 84e6e8d1697e6336f0e985e8c99d3c0e40aa1795d46806847db12c2d66fa73ef
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, with heuristics indicating it functions as a link farm on disposable hosting. The presence of urgency language further supports a phishing or social engineering attack. While no scripts were directly extracted, the PDF structure and URL findings suggest it is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://micruts.org/userfiles/file/kevakasomefegudexogotax.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/fafigatodizukokogu.pdf
    • http://mnarch.it/userfiles/files/1756235984.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezaberakem.pdf
    • http://chingyi.tw/userfiles/files/65008615614.pdf
    • http://liccuza.ro/stiri_files/file/65996398944.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/91470305683.pdf
    • http://luckysim.com/userfiles/file/rafuj.pdf
    • http://mascotdd.com/file_media/file_image/file/38080173990.pdf
    • http://resortvillairene.it/userfiles/files/gurorijebafufalozereliwer.pdf
    • https://ctapigroup3.com/contents/files/xesarodosozo.pdf
    • https://kingdomofgodmn.org/userfiles/files/11928530786.pdf
    • https://papiratisk.cz/soubory/favileputosorelaker.pdf
    • http://epmresearch.org/userfiles/files/mobadegi.pdf
    • http://studioarchterreni.it/userfiles/files/vodupuxawaporufiru.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/zewal.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/pupatifiv.pdf
    • https://austarpharma.com/upload/files/menelutubafumikezuxinalu.pdf
    • http://mynigaoe.com/upload/file/20210908142402.pdf
    • http://hantechwelding.com/userfiles/file/2021090201115573499.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/3213909745.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdf
    • http://inbiosa.eu/static/cfiles/files/tiruvibaruwizuzigiviranin.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9cdfe7c786b2aa098cc7180069f4ee53/89673836090.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=knight+runner+game
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e464.bin
dbfc7431c100f54310dea23441f8c265c85fe4169ca43d442c54ace1ff4cfc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10312 bytes
font_01_sfnt_off0000fb65.bin
77c6e0834de203180d003a04e65b9fa5c7f0ce6a43ba074c20e0ab7b0c774d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 18284 bytes
font_02_sfnt_off000129d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes

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