Malicious PDF — malware analysis report

Static analysis result for SHA-256 6317be1aad942c95…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 00:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 98617e7fdaad488e96bedf204163a79b SHA-1: 3b1c963ee9534e673fb3e3085b248b540febb7ff SHA-256: 6317be1aad942c95653810e01d4bd1cf35d3d3747f83159d1b79b16ab0189e1b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The presence of numerous external links, many pointing to disposable domains, indicates a likely phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6559

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://barudan.hk/UploadFile/file/20210905025446055.pdf In PDF document text
    • http://chip-chup.hu/upload/file/59627523961.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/katuvuteza.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/lekekisuzelefide.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7fc1c14cc220265fd0bbcf2adccaf37b/51135456895.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427a247b9a8---mitotogofefiradosarewoda.pdfIn PDF document text
    • http://underbutter.cz/download/foto/zawutelixapunigukav.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/43517351459.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/sedajimupuv.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/7668557228.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210907232018.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/rogagaxojovuzusunineli.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/77836946967.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/65746741351.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/53465844400.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/48792054940.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/13718644377.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/wetupiwujibusipuxomiraxep.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/87529648110.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/nolegagolu.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/76306864521.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/4727836037.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26781254417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=last+empire+war+z+modPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 10504 bytes
SHA-256: b0a924e071aafec4789100ecb93e1b38342563271873f9b7f5f5aacf91db8b7e
font_01_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 18104 bytes
SHA-256: aa37f821cd87a46394dad53e55f2bbf04dded4bde3416aa63e7621d8b3d6185a
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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