Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b57e39aea2fe59…

MALICIOUS

PDF

156.9 KB Created: 2021-09-20 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 376346abdbf0ce7d3d1151f08c0e4a7c SHA-1: accffa0c795f2ca810964f75b91c35be25336efb SHA-256: 45b57e39aea2fe59076fa8a07f674c7da3174c6f71507978ab3df567e4e494fa
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks. While no scripts were directly extracted, the ML classifier and heuristic firings strongly suggest malicious intent, likely related to delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://old.smartplus.pl/ckfinder/userfiles/files/zenatedisetijexamidadera.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fepafibumavepe.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/81076722425.pdfIn PDF document text
    • https://temahr.hr/files/bubomedurufu.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/kebazuzo.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/disekepizagobajit.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56312878737.pdfIn PDF document text
    • https://hoavily.com/uploads/files/34207434264.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/lijalokef.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/3416191890.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090203082873499.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/soxedavinefeb.pdfIn PDF document text
    • http://vo23.ru/upload/file/68393486025.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5fc70cc38dd5e056c92a0d914f8ac272/sileji.pdfIn PDF document text
    • http://101balkon.ru/upload/files/19733940156.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/69197303624.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/96447253595.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kanakejinusakone.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/13008622725.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e275eb49109cb8306ebf7a5dd7839051/fufire.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/jowaxajopo.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bifaboba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=custom+rom+for+redmi+note+3PDF 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_off0001fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCA2 10608 bytes
SHA-256: 6a18f87d922584b52b6bf926d81b08ce5112b711d9613b2243fe01528fdad02a
font_01_sfnt_off000214ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214EE 21524 bytes
SHA-256: ef9ada29fded81b435f0e38495aed2c0ac8d0260ac0e8b33abc6b12fffa06098
font_02_sfnt_off00024de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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