Malicious PDF — malware analysis report

Static analysis result for SHA-256 63456c9c9302e6ff…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb4ccf3977b82893c3613c3b67ba331e SHA-1: 0b394a5cf2ae548fe2f6a6ff77084345fda9d02d SHA-256: 63456c9c9302e6ffee8ba9137fdf02fafe4e6f3108459f70973f64d536ce5ecc
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or redirection scheme designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://acsalma.hu/userfiles/files/mitigiribekavalumovutul.pdf In PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/58853581308.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/muremuzivopu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xenubokif.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631192622.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/58427567707.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/29133007697.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020848165666.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/67695491076.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/puxawopunawarifiwivi.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/17583166483.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/740025736.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109011410016859.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/wasomaxijokipalixubunipo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/99834532535.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/kevuvinekimuvirogalarel.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/fewiwedu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43439e207---tugakobuvew.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kudofipok.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vatelimuju.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/vilelokife.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903175847.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/11169990805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+apk+from+zip+filePDF 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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 15952 bytes
SHA-256: a5954f03d46276bb5797be1029003e7a51c28908baf81b8edb2468cd5257ed97
font_02_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 10748 bytes
SHA-256: dd3e5bb4cd0133f6432c5d0327de1caf6f677e86f4c4d2cf379a81ac16280c3b

Open this report in the interactive analyzer, or submit your own file for analysis.