Malicious PDF — malware analysis report

Static analysis result for SHA-256 55192b0a0228450b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 00:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ab8d4a2de2e581a3f10d73e351152253 SHA-1: 1455e809544e265a46541e65ae65fec4a39653b5 SHA-256: 55192b0a0228450ba3469a6c468fe0d0c53e85ae7dfd66e16b37d42ae3a38531
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://barcelonacentromedico.es/files/galeria/files/defijazafoxapinidoxize.pdf In PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/ledarifod.pdfIn PDF document text
    • https://tomas-music.com/contents/files/73286888434.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c7e6ba7879c7bd3d190b886d0b97a3a6/12899517116.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/19200515759.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/52165242975.pdfIn PDF document text
    • http://ahchala.com/img/file/66583540546.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/48831707223.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/voguguzesumirekejigotiliz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bosapetazorizokufomufiwet.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/18057108998.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/lidekowinokejanalejitu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136476d564fe---jubetavedekun.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tevoruboruvaxupal.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/rafatutupawoxusipi.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210906213836.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/javowukugasexenedewu.pdfIn PDF document text
    • http://travellerisland.com/files/sufifowokerelokad.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vawugivitomo.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/87261056867.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/233942535.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/62319796654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=random+forest+algorithm+in+machine+learning+pdfPDF 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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 11112 bytes
SHA-256: 9b6cc51634f1c43d785eeddc2fd68e879b9c2eff2bf7132138cd7e0fb154c390
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 17204 bytes
SHA-256: 79625956c39a59948d025e38f1447e9952226f33c8ff462089aa2abd6b3c8254
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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