Malicious PDF — malware analysis report

Static analysis result for SHA-256 662e1a748387c25e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 14:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a4423a66313b1e3d08de20764aab066b SHA-1: f045b1d8166a71b5d7e1e63dccdde2f60d71af4c SHA-256: 662e1a748387c25eadb09763d4257da90457e0615e23ac35dcbb443e32b44417
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=clash+of+clans+hack+unlimited+money+and+gems PDF link annotation
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wizeliburonotesukegufel.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9418978804.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/35808785086.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec324103a6---88358192524.pdfIn PDF document text
    • http://gro-felix.si/uploads/bukolepuwuxepenobelom.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/weronivegudaxojukaxuvu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161357ef729852---74752016102.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/18933893718.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/wusepon.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/wukojitufuxunezogek.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/43751712916.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613179f3ead22---vuwibokikonamasip.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/13271754339.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/20027354585.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/83555837196.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/81347738813.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/kibipajuguv.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/34285668468.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/futipetujatotaralireb.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/66590426865.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/60901587243.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/77561553325.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/sadipurapube.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/51902194590.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/zapusasemejodegubowosefe.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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16728 bytes
SHA-256: 95edac7bd9bacda78dfcc33c4428f906f05b82ba174b91ed1414c9b407217aa0
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 11160 bytes
SHA-256: 4b28d662fde6a1cc4c0c01d941b639f937fe395287243467410fd85f54437b30