Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a4017b27a39d64…

MALICIOUS

PDF

69.0 KB Created: 2021-09-11 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9fd7b36791ac9aba0c1dc6cc7fa31e7 SHA-1: 40cea8a950d4371c16985b3af0590c27f51b4e32 SHA-256: 59a4017b27a39d6496b3a8b2efb138ac74f2881e4d2adecf6c8f213b73454d84
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable links. The heuristic PDF_IMAGE_LURE and the high ML score strongly indicate malicious intent. The document contains numerous embedded URLs, with http://lyzph.com/userfiles/file/Fl202109111247348377.pdf being a primary example of a potential landing page for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lyzph.com/userfiles/file/Fl202109111247348377.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/liwetibotide.pdfIn PDF document text
    • https://avenue102.com/uploads/file/72871497149.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/wuvaturepelonugulekamaw.pdfIn PDF document text
    • http://schokozentrale.de/idata/saxenezujofetazefox.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/9126032184.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/36180086781.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/dalamujajijutosaxudak.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/muzemuvawolurufagokonuro.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/23518204314.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/37371865751.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/84003678650.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/52438217741.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/vobesi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82de8d727---galow.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/naxapikinuzedexixuzel.pdfIn PDF document text
    • https://architektor.ru/uploads/file/15477466921.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/warononaxen.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70977165322.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/gafarijetolaviwerobe.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/56823088856.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/vetisogebagimas.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/3293164261.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/98961576931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sum+rule+derivatives+examplesPDF 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 10672 bytes
SHA-256: 854b7783d388b32e22ec85c90c75441071ec38c2b69e26fe59eb79ce1d6fbf33
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 14200 bytes
SHA-256: 886183f30f7008c714ed09093129a5eb4292e74de29a9548b3d0304be5e9aa5f
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1