Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec5d5c49b961b3e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 09:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef1cd79b11019347f57129efdb1807b9 SHA-1: 827bd32c99056276c16bae6c3891ead63c1559e0 SHA-256: 5ec5d5c49b961b3e7890b47ebb73baf8684b133b248162f23174e6a7969da92d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a non-clustered link farm on disposable hosting, reinforcing the phishing lure interpretation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6098

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 https://irlanc.ru/uplcv?utm_term=galaxy+note+20+ultra+5g+vs+iphone+12+pro+max
    • https://dienmayminhchau.vn/uploads/news_file/tumuzuluraloriduwosulati.pdf
    • http://3qbuy.com/CKEdit/upload/files/dojolote.pdf
    • http://vonschickenfremont.com/uploads/files/nererozotenuruxevijilop.pdf
    • http://turbotechnik24.de/userfiles/file/20020603739.pdf
    • http://szjwwj.com/userfiles/file///63352327867.pdf
    • http://bmcnx.com/userfiles/file/87999420142.pdf
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/takeferijageburizu.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67338052031.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613923f3d51aa---muvisivolexunuxoredawigog.pdf
    • http://kd-council.com/upfile/files/kadelelidigatatafuguji.pdf
    • http://nadafashionbelt.com/Uploads/file/wawufenivitajujanedaze.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/774c97da99d7b25cc54ce61a614c7dba/butonajusebajakuf.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/patexixugoj.pdf
    • http://frankifoto.com/uploads/pages/files/sibadefilu.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/mukexobi.pdf
    • http://gianniarnaudo.com/userfiles/files/lenegazulavedojadij.pdf
    • http://guojingmall.com/userfiles/file///3543569580.pdf
    • https://bwhe.in/ckfinder/userfiles/files/povegikujuxijogi.pdf
    • http://boxethai38.com/upload/file/3554755499.pdf
    • https://prosaison.fr/userfiles/files/16474432534.pdf
    • https://muratay.nl/userfiles/file/19961682201.pdf
    • http://www.santamyoga.be/images/file/40711586313.pdf
    • 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_off0000e3a3.bin
df9439fd8724b036d6437bfbd833f4f46771d31fa07aab50616c794a83ac8d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 11548 bytes
font_01_sfnt_off0000ff0f.bin
ae7b7e6ce28c9274c6d6ce53787f2c6d5521832033681f57a05c66334bd69572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 20868 bytes
font_02_sfnt_off0001362a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes

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