Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e52a8f007d8dfff…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 14:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49f9fbd827a2ed4da711c0f25e2a1a73 SHA-1: e242ec405f995e197434311324fd762d725d1064 SHA-256: 2e52a8f007d8dfff60d45a7a5c78a048200d287a13842c02199d9fad8112faa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The embedded URLs and the PDF structure suggest a link farm designed to redirect users to potentially malicious content, likely for malware distribution or credential harvesting. No scripts were extracted, but the overall structure and heuristic firings point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/55480902896.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356cf25a208---tatofebasidaloda.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210901_171016.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/meredasuropezikel.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d2abd88a9357a448df2f02a3409877c4/fomuvatobitapatugodutufa.pdf
    • http://manenshop.com/upload/files/69918096681.pdf
    • http://changrung.com/ckfinder/userfiles/files/wusimexewan.pdf
    • https://dellrein.ru/content/file/zidal.pdf
    • https://smartcrm.cloud/upload/files/xefenewibapibofebijidesaw.pdf
    • http://finliz.lt/i/File/84191387408.pdf
    • http://capableapp.com/uploads/files/pirexigo.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/21201012420.pdf
    • https://mikludava.lt/images/files/90958123990.pdf
    • http://upakuika.com/img/file/79491584253.pdf
    • https://at1-turbo-j3t.com/contents/files/fovurajaledapevumugofe.pdf
    • https://mollis.rs/files/tugodub.pdf
    • http://vizugy.hu/uploads/files/files/34497380705.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/mekiwuxi.pdf
    • https://casabresciani.it/uploads/file/rozobokolugedipav.pdf
    • http://wonsakai.com/uploads/files/wefutumelofipurebe.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/98055225056.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/nutozononedod.pdf
    • http://safiorida.nl/operatori/userfiles/file/kamaxedo.pdf
    • http://labradory.pl/file/jolazadutorudakirezese.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=get+it+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ec.bin
a9b85f70c82a250547f9720693d984410449dbea342cb408ce94fb1eb8d6fe9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 15672 bytes
font_01_sfnt_off0000dc9f.bin
2a3414016b62a16d3b089ef4737ba0641eb1cf7d9599c768681673100cecda9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 9836 bytes
font_02_sfnt_off0000f26d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16792 bytes

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