Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c0ca8eab4ec136…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 04:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84aeefb42910a749957d082ddeaab465 SHA-1: c708e4217a4c86bbf7b55f32e8d76be653874ffd SHA-256: d2c0ca8eab4ec136e20c892dac8dcddd92f41dc072ef58119d50610dac9fdb12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are flagged as link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=battle+cats+apk+all+cats+unlocked PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/9979385560.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612edd63f03ec.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/megebiburivuvina.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/8149012477.pdfIn PDF document text
    • https://beaszemin.com/files/69720509440.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/83094978396.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/delibomaxamunaxobibesene.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/gemabomemuzilolega.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/368166393.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109201203235103.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqthie8o86gfpdm7c2f3haasc5/zexiz.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/32943586135.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109280208359368.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///44952403766.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/valuduzegumepixexadexofu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xupujazitila.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/guwozagikoniregotegajazak.pdfIn PDF document text
    • http://pasaru.com/upload/files/dotojumavenatu.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/jajob.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/4094890585.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xasubesodipe.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/xojabiririzivi.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wakeb.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/jofoga.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_off0000ae79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE79 10560 bytes
SHA-256: 70ca544c4ba0471e1a33928846854c0f8f7848f57b7666839151fa3540fd31e4
font_01_sfnt_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 14820 bytes
SHA-256: 6c142bf7b370838234d0e597656100bebb1007b7020c936002a83004f04eccab