Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddb6f248aadea4f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 03:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07eef31020017a1c215634c80f4b9f48 SHA-1: a2c084402291b77bc722ea3282465fc8634f2259 SHA-256: 4ddb6f248aadea4fd0c59ab43cd16a1fd8b479553335a5d67aed1b7900135e79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that this PDF is part of a link farm, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=redmi+8t+android+10 PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/fefezatulajovesakilolak.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f733a19d44---semisisibuzolobuz.pdfIn PDF document text
    • https://producto.works/userfiles/file/98071148789.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/14261883339.pdfIn PDF document text
    • http://js-space.de/userfiles/file/vazemurofito.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/pejole.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/tewediwanufozaziriz.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091119051099050.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gedapelo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/45918370650.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/nafotebufesakagujo.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/11888662355.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/56098678552.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/29688525757.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/99629709061.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/welefisobu.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/3314134397.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/33218382716.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/96983643112.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/57799651166.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xafakozitomef.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_off0000ac52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC52 10620 bytes
SHA-256: 2dff41d5aea81dfbad9f3187bf8815cce46c5d85f416eab98d7b28d6eac35f03
font_01_sfnt_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 16980 bytes
SHA-256: f2348ecaa8e27269eec58a1179628a683d3a87cc7cda2e594e30261af28a440c
font_02_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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