Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ea56108c0249a8…

MALICIOUS

PDF

92.8 KB Created: 2021-09-13 14:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1379b32e420fb47c12a81bc90e85456 SHA-1: 5d898f82d44d25f25ef30f839a53607bbfd56d61 SHA-256: a6ea56108c0249a8f8ce7a3c9dd12af6b727e79776faf376264bd279480b37ef
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4720

Heuristics 4

  • 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
  • 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://cainghienbinhduong.com/uploads/userfiles/file/34384494434.pdf In PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/linulunufitejonig.pdfIn PDF document text
    • http://livestocktool.com/d/files/42227418175.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/32781349943.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/22434052537.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/fefopinagakusa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613962baef0fc---41916992830.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/82042599943.pdfIn PDF document text
    • https://eetravel.net/file/vuromas.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/leluxow.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_17_08_59_5554.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19b6865c3---mirejigupola.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/1992468972.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/70142872146.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/59802040051.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zopafagunatirigepolanufu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909103449.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909030628236308.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/75750768574.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/24570648539.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/99887992409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=worksheet+of+tenses+for+class+6PDF link annotation
    • 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_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 19456 bytes
SHA-256: b78028c30ad9b7cb990cc77def284947ef2ce2d77a793e801b0b1d26bff81369
font_01_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0B 10596 bytes
SHA-256: 709ded47e8cf0fc68e48ae3384dc994d58543753429ecd02ea94461007bd6a7b

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