Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45a3af89e29a37d…

MALICIOUS

PDF

90.4 KB Created: 2021-09-11 16:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60785c6a095308177f42124b43dabb2d SHA-1: 40e3faf5ed767f5466f234b586ce6867468f5159 SHA-256: d45a3af89e29a37d59964b178f076f48d00f1d6a9db7b486e2aa28b786ca027a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fullmagicweekend.com/ckfinder/userfiles/files/12243544092.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/xenavimegisisijixozo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398f1396df8---65619530149.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/91157700223.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/47473506414.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/36043174537.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/58392008573.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/bujuxuxubazixojen.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/fezokenoluwedamirubusadov.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/kamuxef.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161336ddb61ac8---80024870517.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/18863816896.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/59990007619.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109011338404679.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/fujotemim.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/61899534293.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/faxaxododubamafanimosejop.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/92713944551.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/vikadusagojuboxup.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/19227749279.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/74400940833.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wesenevalubunalek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+warmth+of+other+suns+pdf+freePDF 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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 18884 bytes
SHA-256: 187b6db7893c8fbf69976a3b01ae7a37b84a2f3a519e77bf991ba1c17363bdcd
font_01_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 10772 bytes
SHA-256: 42434e354bdaca3cdc57e56f23be0f601fc829523fa992b3b33c927354765983

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