Malicious PDF — malware analysis report

Static analysis result for SHA-256 817641940fa92b0c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 00:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d74e34c675aaac4b73799244a29658a SHA-1: cb97483ab617bb3f214010c6d86c0a4e14228160 SHA-256: 817641940fa92b0cad90f8c007f5354b5bfb63d2325ad9cf7dfdbc37040dbdc8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of external links, many of which point to PDF files on various domains, indicating a potential link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://byocamacho.com/ckfinder/userfiles/files/48235101542.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/gabukenitipuravox.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/luwijedavuxa.pdfIn PDF document text
    • http://castel.lu/userfiles/files/rejapiremijidarogajer.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0a0c109c---21616583307.pdfIn PDF document text
    • http://peoplefoster.com/pliki/dixuvu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/naluxewejutilojesaliwit.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/17031862310.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vizujofunokimukoribite.pdfIn PDF document text
    • https://medius.sk/userfiles/file/29687563429.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/digadojubakefofobodapu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/68791203363.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0de64066---jojapaxukaxilofu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/53242131771.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/13182149038.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/33519526904.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/28312779611.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nonotofozonomuwemopedod.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/dunejo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/80122773775.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pitazofatekopavanutag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=first+person+driving+gta+sa+androidPDF 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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 10564 bytes
SHA-256: ab59a7f42b59105d35be8b0bf4d99241e5a204dd30fe558ad999d6f1abdf76ea
font_02_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 17060 bytes
SHA-256: 674b95e54dcfa0828a67eb21d8abf84cbbbab98385ccdb337fdaf97dde6bd59f

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