Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b56f775f9a92e7e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 09:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b42c628f01f63864f842cb35c134f873 SHA-1: e7ad34d5d9617fdad9aff0cfa509fdc0089d963f SHA-256: 4b56f775f9a92e7e454198147624724bdad440af43ff8a7d9512e4ee058402a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://landbondcorten.com/attachment/file/c548749f9979d4c73a9f08c6ac160eca.pdf In PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/pukikiwunejozufuvu.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/76781760143.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/29846020936.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/36057431318.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/rovojebexolebebitezikod.pdfIn PDF document text
    • http://idcla.net/upload/files/77652319463.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/3197249660.pdfIn PDF document text
    • http://vaynhe.com/upload/files/54103009442.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/61384226979.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/81628141547.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/mamasepo.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/39341715540.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/rerebuzolel.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/wumenasaxitaru.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/69751157628.pdfIn PDF document text
    • http://opsir.eu/files/file/9836439448.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4501c9fdc---43018858019.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/8156971510.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/lopubozew.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6543852653.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/mukebeda.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/24910675050.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/81d0a965511fd6b50abe1865aceb4a3b/64957449618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=game+for+computer+windows+7+downloadPDF link annotation
    • https://b2cdemo.tickets.com/content/files/10055325192.pdfIn PDF document text
    • 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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 17216 bytes
SHA-256: 471127d4cb479c35dbfec50f8bb4a3fc22f9adfd2d69c0fad0cbdf2f09108098
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 11056 bytes
SHA-256: b8afc2d0501fcacf98c5f76fed8e58b2ae7d29464ac9ad53ce6742095de2b8f1