Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdea30a9211d452…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 12:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a8f230718951bcfbec40c2f6eeab18 SHA-1: 2317115a024390ea269dbeae13d4a81b5bb31cd7 SHA-256: 1cdea30a9211d4528bddadf14f6f8a7927fab266be24d56abe2efab86bcaa385
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7606

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://union.travel/ckfinder/userfiles/files/gumisamotogolibulumep.pdf
    • http://samtle.net/ckupload/files/zotisidorawirigi.pdf
    • https://coluer.ir/documents/file/63638197375.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/1310948715.pdf
    • http://www.awakohchang.com/image/upload/File/ipol.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/rufidakixidoku.pdf
    • http://bige.vn/uploads/userfiles/file/82543101448.pdf
    • https://charming-dc.com/uploads/files/202109062105549910.pdf
    • http://retrofotr.cz/files/file/laxosebokifasebiju.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/katuxilejenabatedowuwa.pdf
    • https://alyosserspneed.com/userfiles/files/wenobejizizaselofibiwomuv.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdf
    • http://hyunshin.net/userfiles/file/20748992064.pdf
    • https://numen-wow.com/userfiles/cloud/files/wazakalis.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/tapot.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/95469641088.pdf
    • http://neoclassicalmansions.com/uplds/file/61383459104.pdf
    • http://ombs.ru/uploads/files/50923730557.pdf
    • http://tiwtactic.com/userfiles/files/latisipezixaroka.pdf
    • http://lumieye.com/userData/ebizro_board/file/suroxo.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/falejivorame.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/58163851952.pdf
    • http://bukhatirhomes.com/userfiles/file/7493395980.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=photoshop+like+apps+for+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e845.bin
1c884c562af74ce5e6b324ea424390f40fe81078091cf9a59027d3796ab962d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 18056 bytes
font_01_sfnt_off0001172d.bin
fb7421f8613126b1655bc2ef6ec4c6fdc7a016814e460d96e5ced810480be0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10688 bytes
font_02_sfnt_off00012fa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 16792 bytes

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