Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0765f80cb0dc803…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b655cf78e40fcfe9001c5f02f9ff5ce6 SHA-1: e66d5bafb9b57509756576c5310a04fd92f6cf53 SHA-256: d0765f80cb0dc803860c537bc5b5252f9b9d14ed5e7c032515876ef37eb8ea7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF appears to be a link farm, with numerous external URLs pointing to potentially malicious content. The embedded JavaScript is likely responsible for initiating these redirects, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://parlagame.net/calisma2/files/uploads/suvenuzito.pdf In PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vitezajamuvaduvaki.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/11589826936.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wowamufele.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/sulagadipukodedaregetavuv.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/9092500459.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/54168747208.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/gulipawitomagizarovozik.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/59243439537.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5e7a3d8---wepotubak.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed577d1aac16dc069090ce3f8c866c6e/82341962227.pdfIn PDF document text
    • https://asi-filter.pl/files/file/16313242366.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xerepokawitopofisajo.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/suliwi.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/fuvozilegedutu.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/vugutusegajugigarijupolu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xurimanawolejolazubabenol.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/kofemanevabipitotuj.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/mijefuneletaxewone.pdfIn PDF document text
    • http://szpk.hu/_user/file/97605870776.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/77545264936.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/tusum.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/sikogujefazukidesufuv.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/67065050248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=doraemon+live+wallpaper+downloadPDF 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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 17336 bytes
SHA-256: 1dc31adeb652e0630931261b3b7a99884d4ed83a7f05cb1123ac7fdbf9de7519
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 10440 bytes
SHA-256: c22ced45499d8131c2a45b8235b86bd5ccfaabf372991f393bc28d0fa6795988