Malicious PDF — malware analysis report

Static analysis result for SHA-256 e306225e44998c8a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 16:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 809030c7f6c33b348e87c2b62c3eab0f SHA-1: 3a9c415b6a4363878536003f058808db901af562 SHA-256: e306225e44998c8a423237ea3a4f9fc0f4425767c9ea33a3b2dfee636d6ee0e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://essaidafm.com/uploads/FCK_files/file/37783638041.pdf In PDF document text
    • http://duet-czluchow.pl/userfiles/file/fubale.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/julafegabuvaxagufel.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/mafarewef.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/sogom.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/90208561375.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/kifoketazanebo.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/28908498183.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/45832468952.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/65788328638.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/28328510161.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88351516854.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/jemuxigarujo.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zujubidinobulugemodekupu.pdfIn PDF document text
    • http://melabo.com/upload/files/somulerakofevegovale.pdfIn PDF document text
    • http://clingac.com/d/files/zififimovatozinunegasaner.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pozesupadojukobezi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130afe9daef4---konobupanepamimukesik.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jovolasamomulavuzag.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/65858446290.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kimivewikigixuf.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/84544849538.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125c0aa4cb---32802886754.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/52808575870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=st+ignatius+examen+of+consciousnessPDF 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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10812 bytes
SHA-256: ab4db50e6b2cfaa6926f3ed7d5c6d8cd79dd431462927fd0289b46f283fae0b3
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 17896 bytes
SHA-256: 73f5f656a04ac293b9100b5a9c64645e41b2c29041cf39f2bed9c17f7807b547
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1