Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d3bed687d3710e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 10:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 113ec4f67416e2600db2c249d359bcba SHA-1: 9dd9c15b53c3de3aeef7c4aa4615009ceb0a97be SHA-256: 37d3bed687d3710ea33adf0b6084d780929a1bbeaf82a462904a32d2231abe60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://lighthouse-connection.at/myPix/file/28748422514.pdf In PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/xaziberurikeno.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/tixotanukavak.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_FAE2A5BCEBDBBF6A.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/nosuverutuwujodukizokuk.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/21864870016.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/87495569560.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/99895290159.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/19959074244.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67897910621.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/54682885226.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/47483677813.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/zofobe.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/83874734540.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/loguteka.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/19167815979.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/nubetukasiguwulifivu.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/bolefibovalesovututujuz.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/64455900670.pdfIn PDF document text
    • http://drironcat.com/images/file/momuzejidiseramasadafode.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vamup.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/46929088063.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vovirilanojo.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16658281838.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/88458626988.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/xatizukupenu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/jifowifefupaxopij.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rogesudidaxijedidofaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=downloader+mp4+onlinePDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 10452 bytes
SHA-256: 7006b14a20ccba5af33a4099e6b79c41e0b5f84c36d34b00750fa782df9780a1
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 18128 bytes
SHA-256: 64ea82106e46af6e837bfccdafb1d36108be0f5c6b5221c31469e6915f7a9a7d
font_02_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1