Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26390bd45a95b3f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0a62584d185e909ba4cca7ce06bd429 SHA-1: acd83d9c518a26d5134b456894e787cc53ea061d SHA-256: b26390bd45a95b3fef3623e24f35e1eafc1bdca4776463b76c4817a1b30b579c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • 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=watch+the+kissing+booth+online+for+free PDF link annotation
    • http://biosurfest.com/userfiles/files/xejojegogaxag.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wozatusubifumuwiz.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/tetuzepekasitekej.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/80959223624.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/51443163774.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/40500500788.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bawaxedukudoparupek.pdfIn PDF document text
    • http://alltechsro.cz/files/93001750268.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3a77d363---19092181498.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/siwovivukavufa.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/kalijoze.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43343108847.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/43694620469.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/kimivuwozixuvurevarafatu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145317a0bbc3---saroduwixexatoro.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/dusadogemofi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/fukodaseguji.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/9958702617.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fonetofejanoridinipoxi.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xuxepaxakuluwowexodu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zegesavuzogo.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/24623197656.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/88757695002.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/58435027507.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/36749072298.pdfIn PDF document text
    • http://tianfonmm.com/d/files/56006776834.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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 10840 bytes
SHA-256: cf6cf405179647fd2136f7217941467f5eaee54d516dc3f156bf3607e79b97a5
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 19308 bytes
SHA-256: 14e107d1267a858e1bcfb54a5838d270cceb6ab98d4818b71ea26d1c9e52e3ff
font_02_sfnt_off00012eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1