Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b064414a4f8a9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 10:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af8fd668c1c0ed4468d78eaf43f7b576 SHA-1: d4758fb91d9bd71aab635b1ee7df7842153188b4 SHA-256: fb3b064414a4f8a95317487eca2ff838cdad3791807578d336ec8a03e27853c1
154 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that this document is part of a link farm, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=what+do+you+do+with+the+ender+dragon+egg PDF link annotation
    • http://lsphc.com/userfiles/file///55356884724.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/xumezudazamiji.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/lorazomop.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gijirufoxudigoso.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/14284210503.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/poposekoxodi.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rovukimizigidolanisevifa.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/42616096522.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/36101478224.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/jozumiduwapopaz.pdfIn PDF document text
    • https://blugarden.eu/file/53636364930.pdfIn PDF document text
    • https://emprenderem.cl/files/82619818479.pdfIn PDF document text
    • https://webhosting4.net/media/file/29996236914.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/dotawafimafiguwadumilefiw.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/wepubig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/92682097442.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/47311414563.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/zanuvoxe.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/baxolu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/tulapi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613067d10c5f3---84080856831.pdfPDF link annotation
    • http://kavtas.com/images_upload/files/naxobasetefaragizupil.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 17860 bytes
SHA-256: 9b7ca6e162a1edcb54fc07f8f1c5dfc672274e3e08018c4761668a522804884e
font_02_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 10608 bytes
SHA-256: 2a2b7f284293c182ae069b647beaed215393576daefdcce10946330cb58a5aaa