Malicious PDF — malware analysis report

Static analysis result for SHA-256 7610d77258162288…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 01:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98ce73603fbc6a20054f448694041d8f SHA-1: 839286114c6603960eeee8e304aea262615acc21 SHA-256: 7610d772581622883c4a6d4df559902f0bab550d3cf463dc5e2bee1eec3ac4f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to trick users into navigating to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/629f04ca276132cb2476c5ef711816fb/fexeva.pdf In PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/danezosuma.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/tijonizosedisifedibozizum.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/812977219.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///vunedevoru.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/zosuvew.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144303d5be09---noberiterarope.pdfIn PDF document text
    • http://school15-tyumen.ru/f/xokelopubefemotij.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/14381094967.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pupekolar.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38146647568.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/68435256306.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/surinuvovagamijo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/tomurigazenov.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/gijubipemofefupere.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/zogox.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zebabedepuguzedekux.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/bomotiletafopanibal.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/lipolevawudimemakelusevu.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/balakemikudaxuvomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+dr+fone+for+android+full+versionPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10504 bytes
SHA-256: bd717be6d9cac6c6e2aa28d8b89c9750bbeaa23c5613f36fa690394d97c74487
font_02_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16172 bytes
SHA-256: 6f6ed967c29f5919d5ace7cda873721bc7c0b548f832d38376336c047aaf4ff4

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