Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f84019e59620b5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 18:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7497b3481b486f814470d1e9859d0d4 SHA-1: 189fd4778709aa313dc60d72e2b668fcf3c8bd8f SHA-256: 21f84019e59620b5842097e2fcb6bfbe2207a6d6bfacefed33b1b6d73346e693
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://krisoc.ru/uplcv?utm_term=superintelligence+paths+dangers+strategies+pdf+espa%C3%B1ol PDF link annotation
    • https://quanghuydulich.vn/img_duhoc/files/3099846528.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/242613533.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xolososugelunuf.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8c60385a---39476166925.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/10150055015.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jediwozemerufew.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_ACFEB5AC49FB011E.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://rvhifi.cz/files/file/mukururure.pdfIn PDF document text
    • http://lblussana.it/images/file/74805395263.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/37884285713.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/44268540468.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ff66213d---66825685313.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/68299369718.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/nagakibuxubalukapeg.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/10462614750.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/18871785325.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///borilefisatev.pdfIn PDF document text
    • http://dogable.de/userfiles/file/12480335770.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xaruwixo.pdfIn PDF document text
    • http://szpk.hu/_user/file/45902052577.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/85003743317.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_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 18600 bytes
SHA-256: d93474886533231f035b6b92f70253db0403c6b50497f855e4c8414441fdc189
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 11280 bytes
SHA-256: 30efa70c6cf3872af08c65e1dc3da7ef6ce7247926c807ff010074bd0d7b2ebe

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