Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e429c5c5fa089d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1684b881574e613a2e1b36bafcb0a0c SHA-1: ecc7d867680c3936a50bf85a9021e9f87e45f454 SHA-256: 45e429c5c5fa089d3e2224a793f8d28ef68c0fec9911b7544fa6415b75182c83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=diskartech+app+free+download+for+android PDF link annotation
    • http://beautybybelief.com/admin/images/file/1141517838.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/dovavurutibomegupax.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/54708201765.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/vugefokipitizekikisut.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc98a30be---82524571279.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/pibonudolorisixetizor.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/88048671049.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd49e8196---28249673422.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/23224921987.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rimoliv.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/66772562852.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/36003963991.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909180710.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-7/20210907110814898685.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/38910144929.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/sarabuni.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/zoledo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/giduwibib.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/53081310070.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/takotuvularisunoluwigugo.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/papubefo.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74155899991.pdfIn PDF document text
    • http://ingore.cn/upload/files/80249678247.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tagerejizijixufav.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/tewobokapaxovuzimapu.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/50200386361.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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 10896 bytes
SHA-256: 0d0358cd6bbedc1adcdbba907467c5321e2ed0fa82e28ddaa9ed252252a180e9
font_01_sfnt_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 16616 bytes
SHA-256: 074e69167153a7ab213796d94ab78f95fef3365adf5e6c014041ee4dc50290b3
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1