Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff55d9562707005e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 18:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4d0860a6649414c75ee7e4dd2545cf9 SHA-1: 2f52c28efc950c3f96744c7de0b81acca2787390 SHA-256: ff55d9562707005e415acbec99d4c1bedc98e9359b6f6baa993531ffa976a77c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with a high-severity heuristic indicating a remote support tool lure. The document likely aims to trick users into installing or connecting to a remote support tool, which is a common pretext for gaining unauthorized access. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://kimansion.com/uploads/file/kopese.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/janarewimefogitugeputez.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/29977744600.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/nizijiremir.pdfIn PDF document text
    • http://regmac.net/userfiles/files/41864806109.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/66681486134.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/fimejusuduwi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/94159481748.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4209dc1c6ceb948c0c53672d38ef7833/60192348283.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/14356496263.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/40010720603.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46543237905.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/24162203360.pdfIn PDF document text
    • http://tfforming.ru/d/files/99591394404.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zirumipuzuwo.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/fotapudixur.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vixofajoninugodiraf.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2em5hn5ntt6ernvdva8nlsbqn8/93280598987.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/dutimujuvevibadeda.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/veritutalazagojedevana.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vixudoziletituvedoparo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/14/file/66013197247.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/14349450666.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/14502549326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+ubuntu+on+android+without+pcPDF 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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 18120 bytes
SHA-256: 189d46150381d751ab23f619f468b98168b0fd8ffed28c9bc33a91b5e4eb9663
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 10796 bytes
SHA-256: 42b65ad82603e349f81938f32ed3aba0ca13df1473cc991c5e2ef1e66118d519