Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2ed33624ec484d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-27 07:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0176cab32157093e0ccd6490c9096abe SHA-1: 54ffac6c50c1b275392b5c3f4f6fcc7bdf845216 SHA-256: 3c2ed33624ec484dc0d4458e07b0fd0f8528cee48d0b1e42c37097218a9ea5e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdf
    • http://warehousetraining.ie/images/49969643959.pdf
    • http://ecilingirler.com/resimler/files/vimikerapige.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/kajitopusakexabux.pdf
    • http://architettotamborra.eu/userfiles/files/nuriraj.pdf
    • http://unstitchedfootwear.net/files/file/35227188781.pdf
    • http://businessvaluationapp.com/fck_files/file/pubufopu.pdf
    • http://ceomit.com/fckupload/file/wasewafugivekizisa.pdf
    • http://hlqh.net/userfiles/file/20210912052136_422412656.pdf
    • http://robedecreateur.com/img/files/jadujiginigixisobazoxixa.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/14528891434.pdf
    • http://tuclubcr.com/campannas/file/josato.pdf
    • http://clubselectionvoyages.com/images/file/jefamoveloditodupixe.pdf
    • http://fiumevivo.it/userfiles/files/35324305362.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wifemubofemudubudutux.pdf
    • http://factory-01.com/js/upload/files/girofanobobiropikularezu.pdf
    • https://livnica-metalurg.com/images/pages/file/zujaxatitelebegane.pdf
    • https://contemporaryteas.in/admin/uploads/file/34775634195.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/jexolajusuvilaxenezes.pdf
    • https://bloc-immo.com/images/15769855693.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021091114343473499.pdf
    • http://onsijsselstein.nl/userfiles/files/46547389138.pdf
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/98605405233.pdf
    • http://mtegl.wsystem.sk/userfiles/files/visinemedelur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fare+un+video+dello+schermo+android
    • 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_off0000bead.bin
5ae794b4310d902155882fd226d788a1a62da0e18ef42fefaf664df4fbf624b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10680 bytes
font_01_sfnt_off0000d6ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
font_02_sfnt_off0000eeff.bin
a94da43914bd4ca92acc15f9284596e20a53c3b12a64ff1fe531d3ad4dbb01f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 20048 bytes

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