Malicious PDF — malware analysis report

Static analysis result for SHA-256 e435e17e3e27e6be…

MALICIOUS

PDF

84.0 KB Created: 2021-10-05 01:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0c1d7931443a804f7f046038f87bcad SHA-1: dea0c7fb5eb948b1cff3684bafb4c0c1db95c2ca SHA-256: e435e17e3e27e6be31961fa162972269c22d19e9c876ecb30f60b954c70aed07
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous links to external PDFs on disposable domains suggests a link farm or phishing attempt, aiming to direct users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://globalbando.com/DATA/upload/files/202109210953509684.pdf In PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/salajirekaka.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902151723133397.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/68539808823.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/27254516578.pdfIn PDF document text
    • https://serka.com/serka/upload/files/11896936142.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/wapasegazujunolusa.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/werilivupomimomowukod.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/16231272544.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2406f92ot7kq1b1okbmjqa6gp7/65132722691.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bikubokupijowu.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/podiwim.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/tatejin.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/vovoda.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/5298890062.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/saxusa.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/xururejotosin.pdfIn PDF document text
    • https://educhina.mn/editor/files/nugakowonasujeme.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/20597133529.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/rujiraj.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/92188700528.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/luwoja.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/94921698207.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/kabotuwuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ecosystem+crossword+puzzle+worksheet+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1206542b---biwukijedajiwukabifamere.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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 19352 bytes
SHA-256: 94ceedeb428f49f0bee688b07ed7db7eafea7525f77cbc0cb01cdc0194e54472
font_02_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 11120 bytes
SHA-256: d4d3cee7aac1e00e47ff98d8751c2c4fb118da1050cf1525a76d6eaaeea755d8