Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c00a48471208c29…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ef4fbfef5c10bd37e5aed54ea2b5e81e SHA-1: 77143ddcdb3d0c727f6836304eb2c6f23391a2a9 SHA-256: 5c00a48471208c2918ec1510df6868fde97953da4f7b04c08d458875babb3b8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. While no scripts were extracted, the PDF structure and URL patterns suggest it is designed to redirect users to potentially malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sergiomauri.com/images/file/56611702050.pdf In PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vevinatujawexit.pdfIn PDF document text
    • http://asustainable.com/global/file/vajopabutamazedus.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/3426037663.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631006315.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/54906265377.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/31989590321.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909181947_148584126.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/12442132641.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/13663496546.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wisalonogufazagutep.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/63243840919.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/76942593890.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/digewapa.pdfIn PDF document text
    • https://blugarden.eu/file/43317688629.pdfIn PDF document text
    • https://12tiga.com/contents/files/kibokuwojedow.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/kajoxuwuv.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/16314981576.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10521501583.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/73562887174.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/najitilinu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/56244175859.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/82194809115.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///14467403615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+tv+remote+control+app+for+androidPDF 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_off0000c26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26D 10660 bytes
SHA-256: ee8a3c439ed71843024dec1b791bdf413bc21b37cd4c2f608a83736504f39e8e
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16308 bytes
SHA-256: 9612fb4b78fd38adfa6b3a460e6004e64db7313a3bebcecbf6e31b2f3ef204fa

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