Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe57ddc4f2310a07…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 09:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae3cd61d6590f7034c39f6c5024e72c9 SHA-1: d732b02487dcfb63b59938ec26f9aa1a1c617a8b SHA-256: fe57ddc4f2310a0757239abdb6a85b94021f7c92d0c36cd6a71a2809a3e08ce0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many pointing to link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8284

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
  • 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://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/71854712266.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/88633453458.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kumeborosale.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ce362eb9---kopob.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/xifotibakiduzalilutizara.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/lijoxuxojituvovulijumoti.pdfIn PDF document text
    • https://aashianarealty.com/file/povunifupeginiboxonoru.pdfIn PDF document text
    • http://oris-am.com/editor_up/97219567824.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/51811111873.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/romulasafavaguv.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/68979417053.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907025755.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/89305551710.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89429040025.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/33616143711.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/63355414220.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fawavij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=angry+birds+transformers+mod+moneyPDF 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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 17588 bytes
SHA-256: 7d47f4877bcc2e9ec3a03263656ab1e4a4267af2c0f55c338f230f50cd86ca61
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10884 bytes
SHA-256: 9c584e5f23ada0dc2c8c5b1f67aec5538f3b5e896571cc82ef23c42c7f6f5bfd
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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