Malicious PDF — malware analysis report

Static analysis result for SHA-256 0828ce1dc3bc70da…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2949275f7fb3a0bc186dc466d269d815 SHA-1: c449c218811724a64b0865011c83839466ad48c4 SHA-256: 0828ce1dc3bc70da4cc2286e8262fb6bae9c4b3514c0c8b21d76e5190cd40d02
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 PDF also acts as a link farm, directing users to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://meimagedance.tw/ufiles/files/sakumewu.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/19567646655.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/89372479237.pdfIn PDF document text
    • http://videocycling.info/files/file/83234149355.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/vemosewafuxi.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/96043430296.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/70804350406.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/xojusujed.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/pilunafewavizab.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/9315110581.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/6743282350.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/66752389066.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ronelekowinusemadugizedit.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/lavegejasenebilepalufu.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/widoxowisaxe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b9f60682828bd3707c0257e97cf6f0cc/pikixuzazuj.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xamarajevi.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/92204327838.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nufuxuponibaxelujuxeseso.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/98848010502.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908201829.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c6d3d81---kufimanepo.pdfIn PDF document text
    • http://castel.lu/userfiles/files/rejapiremijidarogajer.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/19086558751.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/wabafexaxexukefosediguba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+cancel+app+lockPDF 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 18020 bytes
SHA-256: 530dbdcbc5d55f17f634b902126575b8ad9927df15178a89fe5066410e1ecaf5
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 10176 bytes
SHA-256: b5adfe16de45def53e97cb3a95f40fad78ccf6c20efe089f64fb036c70937bd0
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1