Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a7475e81dd9baf…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 15:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d66994f4e59f41ea7518bbb252c68edb SHA-1: d6f39448951d171393de93a9e67c326780ab6bcc SHA-256: b7a7475e81dd9baf664d80ad3e7e06504c2e0ed4834a4a9adefd561bcb03b115
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. Heuristics indicate it functions as a link farm, directing users to numerous unknown domains, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kangshi-you.com/uploads/files/202109050210502908.pdf In PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/48092634402.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/92747973502.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/23439638490.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/62450583319.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/23102734902.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/jolojis.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02ed38daa---43014897863.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43718518472.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/59523712430.pdfIn PDF document text
    • https://expomediainc.com/upload/file/97855168140.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/27066090863.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/vabivasevusek.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fabefijidafewagik.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/89167158802.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gewesojo.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/11921845247.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/mozubiwev.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/dogigitubejarebi.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/liminisanepipulaxerobad.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/pawepirev.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/59681454651.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/sitavojewesetasikokalove.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/lamojofejigax.pdfIn PDF document text
    • http://twilaw.com/files/files/88781642125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ufc+android+wallpapersPDF 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_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16940 bytes
SHA-256: 2592d3ae49c9be372f03c1095f0e093a05110f6fd4c144dd03f608ff5f730169
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10608 bytes
SHA-256: d77bd4dd96ca1e0de3d855c257183a35779211c3bbcf4dbc1419887a8f5ed21e

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