Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1d62336b01d17c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 19:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 740ca890225236504efbe2337b68f6c8 SHA-1: cf0ff714c8c9cee955a15194ffa919ab1359e15c SHA-256: aa1d62336b01d17cabd3a75a96372813679e9f9761f5422686dc58b883890d76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URLs, many pointing to disposable domains or link farms, suggests a phishing or credential harvesting campaign, or the distribution of further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://daynexweb.com/upload/ckfinder/files/duleperuvug.pdf
    • http://medizator.ru/ckfinder/userfiles/files/57170610607.pdf
    • http://ehoron21.mn/uploads/files/fulogubepina.pdf
    • https://skvely-kup.cz/files/file/gusolideferitabeniguvojaj.pdf
    • https://lemarko.com/userfiles/file/36117418246.pdf
    • http://archissimo.eu/userfiles/files/42676116234.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/vokadesoro.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05ffa0241---75836593116.pdf
    • https://pmms-online.com/assets/file/xefegodaniza.pdf
    • https://brtim.com/uploads/wysiwyg/files/faxir.pdf
    • https://kawanmto.info/contents/files/datepif.pdf
    • http://phaptangpgvn.net/app/webroot/upload/files/39068673000.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukarilojovojexu.pdf
    • http://galluccifaibano.it/userfiles/file/52931157977.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/tibokonefagugezotejikuso.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb466a290---xutazomiza.pdf
    • http://gzperson.com/uploadfile/files/59637678330.pdf
    • http://szolnokepul.hu/userfiles/file/21390053263.pdf
    • http://studiotecnicolamanna.com/userfiles/files/61341387238.pdf
    • https://birsamundapark.in/userfiles/files/24199757289.pdf
    • http://cyuansheng.com/userfiles/file/jabemogek.pdf
    • https://ymy-tea.tw/upload/files/80789448962.pdf
    • http://tylincms.com/userfiles/files/ximiwejidobixelidukiko.pdf
    • http://compow.net/ckfinder/userfiles/files/lufitibenenefupuvosifugi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=y+word+letter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000dc5b.bin
2efae0c04fd8316d5c5a9f9f9d8832fca8be567f9eb6194a33e10701ee638327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 18216 bytes
font_01_sfnt_off00010b80.bin
eb2093394cfd0ce08eb17c8b4a5eda2c05d76e1f6f54aef506ea35ca42fa2084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 9784 bytes
font_02_sfnt_off0001210e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes

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