Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7cc8c71fedab8e…

MALICIOUS

PDF

62.0 KB Created: 2021-09-24 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 44e743b894a44452e7a151783914bdec SHA-1: 10392ce83418f075d4cc7594acc98b0560289fd1 SHA-256: 7a7cc8c71fedab8ebd5c9c3078a0cd8f0f30f298b1e27677e9ebce34aa979f3a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6524

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lojunewozutibufe.pdf In PDF document text
    • https://theipbuzz.com/images/file/24035442231.pdfIn PDF document text
    • https://eclearusa.com/images/file/sevuxitoginivapej.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/24343779083.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/61873915114.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/52694534897.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/98124741082.pdfIn PDF document text
    • http://orderkai.com/uploads/files/nusob.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/mujikerobegurabisu.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/24893928537.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/sijafiganolawamusoruput.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/22932927566.pdfIn PDF document text
    • http://knipia.com/userfiles/file/vozobinitirazek.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/17080147971.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/30510635015.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/4377180148.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302a2684cd3---midefame.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dezoxoboxexemabekijiwo.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/89734142128.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/45636885938.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/46542942768.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/milujofubazibalib.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/74982274278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cara+download+aplikasi+berbayar+jadi+gratis+di+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16368 bytes
SHA-256: d83d120ce846d83d0dd106fe1e6ce54d1826f250df080c274ceaabaafc4a7372

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