Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dbca9d81267d55…

MALICIOUS

PDF

76.5 KB Created: 2021-10-03 06:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07a2dd7efa5eff8766c1d0c80bcda7b5 SHA-1: e8d319fa11f8a6443adfddb4bae94769d73df92e SHA-256: 50dbca9d81267d5512bec91237efcb6a76c1834ae544aefb8cc2eb982d97ecc5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 https://miltonmattox.com/userfiles/file/62699558078.pdf In PDF document text
    • http://thuexe7cho.vn/upload/files/gasitowules.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/jusabusivudu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muvagejuporirikekuv.pdfIn PDF document text
    • http://laserinnsbruck.com/static/xonufimixuporuxuti.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/40253363329.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5c1b5be05538e6aa1ad5a66e8c64dff3/12426043649.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tuxoxizemukakitukuzi.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/38675146316.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/pabijanarawusug.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/vijoron.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/satonemim.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/sepevidonebasoxavupu.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/12037312855.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/gunalagufonitom.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/kutilijojerajoz.pdfIn PDF document text
    • http://aromata.ru/upload/files/dokevefedixote.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/tuvapofejaxa.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/tirumelimes.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/88099562218.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pekufixitop.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/37317139472.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/81950426873.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/majed.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/44931014079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=summer+fruits+smoothiePDF 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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 10340 bytes
SHA-256: 4541a9311bd34ee3d459964f9f7fd38327e97eeb6958cf676ed74be613d2d676
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 19956 bytes
SHA-256: 4d67f0610cd39b6f89c4b1209d8ad64673ed420ba85db13954aebf4fee5b5058
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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