Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11e0f264f5d19b3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99a10e71cebf53cfe0f4abf7277fe1ee SHA-1: 0353c5e4c0b91518fcd39e5dc9b38b69a78cfa3e SHA-256: c11e0f264f5d19b3f2a4e7ba48d0c27319fe7dd893d9117a5a54d381f0fb4965
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hakasasi.id/userfiles/file/30495323525.pdf In PDF document text
    • http://pagodatalk.com/_UploadFile/Images/file/kovufidomazisajogugamex.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jagalo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/rumupubizeriwefenunoro.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911171010993996.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/mebepifujugosedef.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210904_5E7BB0DF9C59B994.pdfIn PDF document text
    • https://soechi.net/userfiles/file/6812232586.pdfIn PDF document text
    • https://auto826.com/uploads/files/jejinojivafedafaven.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8lk595qehug1lb921g4f42c9b6/nimiponozujelejufib.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/13377434946.pdfIn PDF document text
    • http://delve-cr.com/uploads/72994414569.pdfIn PDF document text
    • https://servauto.fr/img/user/file/35926259363.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210906/file/14716547692.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jamubimejujekefakufuviz.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/97311806109.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30908940212.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vaxitaruxolitafe.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nepeburikuvazox.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dikexofopilewalev.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210911_202613.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/73419864578.pdfIn PDF document text
    • https://digireg.si/upload/92964500983.pdfIn PDF document text
    • http://net-marketing.hu/images/files/pebem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pd+te+amo+pdfPDF 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_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 18780 bytes
SHA-256: 0fdc3bbac2ce734170d1bc76302fb4808547a9e5f47df3ab63889292f3a16f02
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10148 bytes
SHA-256: 788d892ae6b77a0cf164df6e5fa06b0d33f61694093a19890377c4ace6f5f967
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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