Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d0aceeb0db43db…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 01:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae8ae471908eefa5faef0edf568a7cd6 SHA-1: e316cc26314cf1405e43dedd505a105ac6cf5d89 SHA-256: d5d0aceeb0db43db73d0026ddb4a89d8ca012ac044b9f890622db042e11c27d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded links, many pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing lure hypothesis.

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://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56289729329.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9a4cfe7---57757594256.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d82ce847b9---918909014.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/32120130029.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/85601115898.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/lugabigeribuzuzawelufef.pdfIn PDF document text
    • http://esteel.my/userfiles/file/27657361484.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/89347414661.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/jaguvelugaweloligofakavi.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/nefibep.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/gebedos.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/79370980107.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/defowiwifimefuraxugep.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/15208803784.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jogatawagimebi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/suxumaposiru.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/89813712913.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/69819547168.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/53938114274.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuzipira.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/sipodubumekilu.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/63601861517.pdfIn PDF document text
    • http://tano-cable.com/d/files/zoguwo.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/10795228473.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/25244403752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=voice+call+recorder+iphonePDF 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_off0000b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 15732 bytes
SHA-256: d7df8a3405e1556f027b9838ff46e3d0d19f1e2e075d1fb6729ae9546e58b0b6
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10316 bytes
SHA-256: 9e3cc5a1b9b7d003c94bd53750f31c04e99301d900a84e84d8be5f7cab751c29

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