Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408373b89a16ef2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 00:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3936e2ff7114d5f649bd42dfcf05eae SHA-1: 2531d472fd2e058e643797ce81a154aefab9b01d SHA-256: 8408373b89a16ef2776e32ae55d8c37eab478ae983731cfb76ba3ac3ea515734
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=lisa+feldman+barrett+how+emotions+are+made+pdf PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137347f53988---31239864328.pdfIn PDF document text
    • https://clickbox.ro/images/file/66349779522.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midofugunobasixawojara.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/wowalivubulada.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa50d850d---96192822733.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/gafatusudivev.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/20690383316.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/borezupevakuro.pdfIn PDF document text
    • https://cathita.vn/upload/files/gaxipi.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/31991231088.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/barofujemusoxibitan.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/81271483339.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/2841707772.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/95776317511.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/xuziguralakizomu.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/33654789178.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/41054243026.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109210512274652.pdfIn PDF document text
    • http://haki.vn/uploads/files/nevanitunavesa.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/70845928412.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuxozefa.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xobokuzaju.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/95778739760.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vozojukajoxas.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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16744 bytes
SHA-256: f13b3ed0dfbc799fc668958aa495518350f3b8dc911d2d2c9b9a623e7e6f2d3d
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 10944 bytes
SHA-256: b08e73aa982306c8ed6c7d1de3c435c470266ef6d80cc1ae5103790d64a778a5

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