Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3b58153bd1f67…

MALICIOUS

PDF

97.2 KB Created: 2021-09-08 16:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4c7dd97c57f097e8ff79a51e5ca202e SHA-1: 323889055cbe38efb75ab7c070cc0b6150bb5911 SHA-256: c8c3b58153bd1f670c4fb14a9ae3e291e030a30889d1544dd01c7384b6aad1ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://jakpaisanestate.com/images/upload/files/29756244958.pdf In PDF document text
    • http://cesarrodarte.com/userfiles/file/21268095040.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/30173580071.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/20751408219.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/36850115228.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vawavumoxodidomow.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/19457613957.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/8043443962.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/pabenaxaw.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/sukifajegefila.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/tawugesopoku.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/lefiwuv.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/74354981982.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/17503984193.pdfIn PDF document text
    • https://majubesar.com/contents/files/75436236317.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca473df3---moxepazozuworunapipiv.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ripovevusazofebovatove.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/77790522171.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfd154277---pekuf.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/94437219809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brain+lobe+functions+pdfPDF 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_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 18972 bytes
SHA-256: 9c877df78dcb89f7098dcb925050b4dae7a1d5dcc3fcaa82c587fbdcd6a6cf37
font_01_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E69 10908 bytes
SHA-256: 4a85872d612bd338b82fb91ef9a04fa3275ff2b0cb36c97459f00caa53d88556

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