Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8e90e41cba488e…

MALICIOUS

PDF

92.8 KB Created: 2021-09-13 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0d967b174e1cec91dc919b529701b5c SHA-1: 4a266ad9ef4b877b85b9ed32d5a5e19423722af2 SHA-256: de8e90e41cba488e69a79a017d4f89136e22931d270ed5feed5ca79d9b10c0d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious sites, possibly for phishing or to download further payloads. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://holland-ex.com/images/blog/file/mujizidiziponopozid.pdf In PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/ramunovugosikafokab.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/7621138822.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372198dd3cb---51881594167.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/47742932026.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/guwodeguv.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/jixir.pdfIn PDF document text
    • http://hiniceshine.com/upload/dozoxitinoza.pdfIn PDF document text
    • https://foulardfotografando.it/file/76920344427.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/96596053626.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xazejufowidagurepowowoxe.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sudimiwig.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/sanapuxap.pdfIn PDF document text
    • http://timebymtm.com/upload/files/tupefoluniritopuranukubes.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/41422584007.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/78487376050.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/87142350958.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/5837818544.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/63274236165.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/83714710794.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/17093179688.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/dabivejivigaxuzudogiru.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/77600129796.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/58711210610.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fitowunalizelubukalozud.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/65337167599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+i+spoof+pokemon+goPDF 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_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 18344 bytes
SHA-256: 1282fdc7d3ba0650a8d56bc27ffc91399cb84ad7742a8a9eb515a5e8ea9d21fe
font_02_sfnt_off00014ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA4 10748 bytes
SHA-256: b5258f01799d3d93f7c6ed411cc013a6ea1123f36c7f0d2c5b5f90e44700d56d