Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b12c809056ffacc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 19:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3feb217d826303e42f774f889d3547e6 SHA-1: 509c66f0870b8717fe8cf814ac774de911f3b310 SHA-256: 4b12c809056ffacce0db6eb586d766273c41c67334f0286b2a8faecf681b0cf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=fifty+shades+of+grey+download+filmywap PDF link annotation
    • http://kpotplace.com/uploads/files/fobawunixofafisanaxak.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/90684dd2b8f6d5ddd84898f435c1db9e/75409768382.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaab9f0ca3---92705130976.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109151159142056.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631022154.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/ronupegosowuruporilipasi.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/42077309030.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/96932872534.pdfIn PDF document text
    • https://ratoempat.com/contents/files/tukafik.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-7/20210907183549660253.pdfIn PDF document text
    • https://maria-galland.ru/files/file/gojibevunikepebejonat.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/76474347555.pdfIn PDF document text
    • https://hoalavender.net/upload/files/38974695115.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/debufexiduzu.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/sotisevodojugakalamewoxiv.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/99557338900.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/84345589660.pdfIn PDF document text
    • https://kaimano.it/file/14621045209.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/26088141763.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/29531064764.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/44571069226.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/50224861854.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/12865019706.pdfIn PDF document text
    • 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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 11124 bytes
SHA-256: 4c62f8fb705faf46f2d1c47938417ec002d16bbfd02367452c5394c66c5b00ce
font_01_sfnt_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 16592 bytes
SHA-256: 936f98d78616ff598c9064970214f808df9aafbe11652f5efaa5e9d03c0e63d3
font_02_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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