Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5115de2f87c470a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-24 02:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a94780ba25989257fe0dd13cad38c28 SHA-1: 1f1c00c0f1b5806680a4ebac59baa308b66b834e SHA-256: e5115de2f87c470a89c7cc52f59de3f4072f8cd6892fa1d8d0a66baa94cd941e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gruaszarate.com/ckfinder/userfiles/files/lasumekegavuxo.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jotipagisazuga.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/22806447655.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/17072264862.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/36184870073.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/45382804724.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dasetufewubu.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/23941220040.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/88060518207.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/wumowamesabumof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7efae31e---65176847565.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/69952219766.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/vexefevezazapeto.pdfIn PDF document text
    • http://unsersohn.ch/images/file/mumowamowuxitu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/penaju.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/45355382271.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/vewowufiko.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zosamivivideninu.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62822742077.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/munuzalanitisowe.pdfIn PDF document text
    • https://clinicscrm.com/img/files/piramufupabesumoju.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b1762b96---21678546934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mastery+robert+greene+pdf+downloadPDF 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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10916 bytes
SHA-256: ab05d27e972b202ebac7dbc57d99f4f5b8983d52bdb2d076b67fa9fd412baaee
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 18788 bytes
SHA-256: 1d525b0aedb8bd63f2caaa87d49a35bcda72656cc379c4ef5849f2b7cfda5c2c
font_02_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1