Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41558c4b654c9a6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 00:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0785a48db9707bd418bfb9c4847cce3c SHA-1: a1d79b646876c4557ce7ec84f503f9ddf8dce25b SHA-256: f41558c4b654c9a688f9aa84fc61297347dcb95c871223cf88aba4d21c5ab3b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, one of which is explicitly identified as disposable hosting. The embedded URLs and the PDF's structure strongly suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://3colorjazz.com/fckeditor/userfiles/image/39618557975.pdf In PDF document text
    • https://mashura.co/userfiles/files/15356127939.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/kilunolotugovidolemasu.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/pivilagatobixola.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/93796845615.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161461cf3b1d72---89601783774.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/baxewuba.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zobutatijujod.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/dumesaditiwitelumali.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135b42fbcb68---26856316265.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/19475094544.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/nedexawoxu.pdfIn PDF document text
    • http://guowangcable.com/d/files/399790346.pdfIn PDF document text
    • http://belean.pl/userfiles/file/50731960296.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/poradanilitajonanodeku.pdfIn PDF document text
    • https://forssh.com/userfiles/file/59228400535.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/mazijobujemudasigitaxolax.pdfIn PDF document text
    • https://tarsiman.ee/files/file/gididematinijibururozofox.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/foxojevazisi.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/44788431710.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/1318637255.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/13349286441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bombastic+bling+promo+codePDF 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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 11052 bytes
SHA-256: 89680f2b047fa6a1d0bb0d444696e2903a01ed8f075f149bf212567cff0fb443
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 18112 bytes
SHA-256: 46bebacff963d39ae1d1cd29334f2e2eefd5b1f2211f3bdbb77281b9092331ed
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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