Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f105bc855f08cc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 08:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7be74ebf48d71bb512148bd838de1b0f SHA-1: 5b8381b0387a1fa1ae357f3493cf9b55a23b79c8 SHA-256: 98f105bc855f08cc1431b0de24b61cf92d79e1c933f37b3728783e9a8630cf70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent by distributing links across many hosts. The ClamAV detection and ML classifier strongly suggest malicious content, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=chromecast+free+download+for+windows+10 PDF link annotation
    • http://trubaopt.ru/content/file/debexe.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/masukufaxodukenilevebu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/wuvedes.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/66608456814.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/30930889086.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/fitazipebejopobubugobeko.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/61575576192.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/30037579249.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/10801633799.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/jubevokaxoxuwo.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/13558316426.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/vetisuvenuxejejipidomigo.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/14700367982.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf38993ff---92028990262.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/63948696629.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/43679165283.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/77430009304.pdfIn PDF document text
    • http://mextro.de/upload/files/20700372072.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mesukibamigazilomar.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/34984372410.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/86001827458.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/mewabobelav.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sutujuv.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/87406742478.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1ee53984dc6c2dc040ea75e3596a843/73888631196.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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 15316 bytes
SHA-256: b199321ce8b48b54cf8eb17f246bf88270e32f93313145225c4354d340d83283
font_01_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 11032 bytes
SHA-256: 5685cb235f65553cd0d8dcfa2139d8105f5212ebe736635a5e45b560739e0549

Open this report in the interactive analyzer, or submit your own file for analysis.