Malicious PDF — malware analysis report

Static analysis result for SHA-256 7515ef92c2c1a148…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 15:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 035b8233bb9d7a97a65a5feb20e335db SHA-1: e91d6a73fcb6fa1d9856d1716c43f79d9f6102a1 SHA-256: 7515ef92c2c1a148111fdcce77d2b5f46a0746102e0244d081ab7f108ace53a4
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 high number of external URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=mi+amazfit+bip+price+in+bd PDF link annotation
    • https://baglab.pl/galeria/file/zizurepazokatur.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/54463842538.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zikuxikunisijofuv.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/63027321790.pdfIn PDF document text
    • https://edusfera.pl/upload/file/bilosukaret.pdfIn PDF document text
    • http://full814.com/upload/files/vaxixerozojojukid.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/paravivesuneju.pdfIn PDF document text
    • http://podushka.by/files/files/tudilupapiwagonof.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/vazezako.pdfIn PDF document text
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_123135.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/85200265813.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/70120707478.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/92833100800.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37750164813.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdfIn PDF document text
    • http://belean.pl/userfiles/file/60356614952.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/jadak.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/80184699609.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10366033505.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kofexejazates.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/25878402697.pdfIn PDF document text
    • 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 19480 bytes
SHA-256: 245238a67f65041b95481643dc4a376ccd0c2508bff1c23148b7351551552009
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 10640 bytes
SHA-256: 46e3a3b7b5cbd6c6bf2d89e1358f980b75570d269a58f9cff59fabaa73f0104b
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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