Malicious PDF — malware analysis report

Static analysis result for SHA-256 4520fccd9f55e297…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4617b44e471bf62d48d1012565a4066 SHA-1: 9c7e19c69c6df1e7c436a685ea48842e76c34285 SHA-256: 4520fccd9f55e297813f2be8ca418c03d9ef608f082c8c5983c1aa9dce2e2b28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect users to a large number of links, likely to host malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://milliondollardesiclub.com/upload_files/featured/files/supuvufanadizosopafazadaz.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b616d53ce59688c1857527d542bc2b6c/metukiko.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/27856746284.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/dezotaf.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf838263f5---mozodobobiretul.pdfIn PDF document text
    • https://primer-spb.ru/files/files/66325856797.pdfIn PDF document text
    • http://villkasz.hu/editor_up/fisozenipirapidokego.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/tizukenutavi.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wedoxi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71658108772.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/vedijuvobodukis.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/bafakoroxigur.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/70207587547.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/23816455475.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_AF4119330A209A0B.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/14731666058.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/80775302763.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/vifikuxiguditebuxelor.pdfIn PDF document text
    • http://tabletopad.com/images/file/81292706937.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/newopepirebupatowusupe.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/908036492.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/nesolo.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kunuvemunuwipuxetuxesubo.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/merolulokax.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/sozerimuv.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/52443523618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=over+g+mod+apkPDF 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_off0000b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 17000 bytes
SHA-256: d496c898470dd79373c6d647a9adfaa346cfb01e1bdff8c9fb32dba516a7a466
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10408 bytes
SHA-256: ad515ac4717a90857cc655fb6c88f83e962bf4b62f59ccab0d7ac2c04b055c82