Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9706b87d777e029…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 02:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7676e7288432c823b67b011844793f39 SHA-1: 8e7f01f71c34a4f42cb19482bb0e10ce21306b7f SHA-256: a9706b87d777e029a2eb4a9f227250ed0fe845017a91d24c638265319c09df5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=pokemon+tcg+set+logos PDF link annotation
    • http://lenosada.sk/editor_uploads/files/49793438657.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadivuvuwux.pdfIn PDF document text
    • http://standdominica.org/files/files/57058271358.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/2904740389.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/bonukeseririnorenajur.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/51647150679.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/29513123338.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/ludemibevamusa.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/jurabodamedekogawejojo.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/dojanirebofimiparos.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/dimavonoxaziduje.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/95967655522.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/22359741350.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gituwi.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/91398667527.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/sidujirebijusotolatile.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/megepepiviludim.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/98002047186.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kovifisebipulepanavifipa.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/48597303756.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/vodaxol.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/16200699937.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/75764296884.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/30131694188.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/97728064532.pdfIn PDF document text
    • http://charivne.info/images/file/lubokamuvibobo.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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 17860 bytes
SHA-256: b48e9a2829d04c5a8460159ebd6001d65657bf11ff8c7a0cd7804acb5bcff8bf
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 10312 bytes
SHA-256: 3889b755c984cbadb97d1a7eed74307f54e53987eb0a3bda0add44899550b56b
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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