Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bdfa6b4efa59fa…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 07:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e003f492b153778c675b09f75a6dd883 SHA-1: dcc1c0a144d535949ad04b1d870811bc63ee91f0 SHA-256: c9bdfa6b4efa59faf032bd4a83b7aa91d146103a1ddd978c4883cec241a02d56
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 presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://video-cycling.de/files/file/71658471061.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/120205c88645f46fb63fe2da16dc7c97/73384447132.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/nowik.pdfIn PDF document text
    • https://majubesar.com/contents/files/keraxixewoxokur.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/83856777018.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/68904720758.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/82827104370.pdfIn PDF document text
    • https://jensbrode.de/files/file/nomimoxutepatuxikojifewa.pdfIn PDF document text
    • http://landpas.pl/upload/file/58820304995.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/sozagezusekonovofutoju.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/88937394717.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/38419099088.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912235035.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/97374754168.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/77789387283.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/paxavazezudupiser.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rajunavivegexa.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95900920339.pdfIn PDF document text
    • http://nscenter.cn/upload/files/95917711724.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/42319576735.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/durabamijoz.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/45627916442.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1c665326cc9c94060e21f2883dc13c8c/15723046422.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zotofobisakizepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=run+ios+apps+on+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 10492 bytes
SHA-256: 372ef6f6dfeb0855e4e4b42d66ae6cb1fbb348e8cba9c23720de45d0a62a0281
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 18208 bytes
SHA-256: 16e2bb3258bb897cc29048967d990e15dca4c88a01c1f7568b6e8ff74a640c07

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