Malicious PDF — malware analysis report

Static analysis result for SHA-256 66845279185669c3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 07:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55165ae60691f680145c8e915aeed7be SHA-1: 880a979f808dbccae637aa3005d6957254712c87 SHA-256: 66845279185669c36eb00ba81f0d618ef90c9ac54db113b76c23ea4df9ce1852
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm on numerous distinct, potentially disposable domains suggests a phishing or spam campaign designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://metalzilemboeventi.com/userfiles/files/rodezijiradobuk.pdf In PDF document text
    • http://daisytalavera.com/userfiles/files/63246889959.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bixatobitixepan.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/vexoripo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/25741451190.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/20784832552.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/mixitagezopovot.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/40028313005.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/wofetut.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/1480058810.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fazanisozotazidoja.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/56477880954.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/6351525799.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109052307318415.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/30620122720.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/jobuv.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/95584987308.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50757c60ead6fa968ab463a3705ea07f/genaloruzewukomoxusuje.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/7580291783.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tinesidemusizijato.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/wolip.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zegalisuwuduzusorowojija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=easier+way+to+screenshot+on+androidPDF 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 17720 bytes
SHA-256: b4c396fabd321f96fb1ec3589052f5609068faeb9ea5ece23b72d913c2dc0e8b
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 10604 bytes
SHA-256: 03b33ba2b3a6bcd0bc807380d00855862c60a7664eeec376284f5be069cc2e4e
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1