Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b591f3f14db887…

MALICIOUS

PDF

91.7 KB Created: 2021-09-22 09:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72d74f2b4ea394f394c9d87210472aae SHA-1: 4aef596fd7e92d6b4a17248e243fe51ae8f48163 SHA-256: a8b591f3f14db8873c03ae334e7341a398968138df40f67e5cde9508a38e9b36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • 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://xn--90aoj0agf7cq.xn--p1ai/uploads/files/bigipolejiripusurezusata.pdf In PDF document text
    • http://24cvety.ru/upload/files/90731224495.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/8409003498.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/39549232423.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/nobexafifaparo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5ecf4df510660acd7e7678e9a3ebeb89/jisalapoxiweseket.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/23996193343.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/lifazako.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090808551880.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/91485351137.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xiwafirilul.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/fuwagakisozobuwikasokabo.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bovar.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210918_123719.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/mudonoxigozuwururi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614932f356b5f---43038330457.pdfIn PDF document text
    • https://gangnampools.com/contents/files/61988797681.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906194946.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/wokim.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41060412592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mortal+kombat+hbo+max+pricePDF 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_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 18632 bytes
SHA-256: 9c6b88caeff45c87dcd49b86d25ee810786d5fd362c26df784081cbeb14c4902
font_02_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 10692 bytes
SHA-256: 9914ee3a70e70674b61d2a8c4b987f73fd121f95e419b977e518a53bedef3bf9

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