Malicious PDF — malware analysis report

Static analysis result for SHA-256 09305065888f7d25…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 07:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2530c4c07c537550f868630b1a31867 SHA-1: a11d7ab4a1bfee5289a72b7fdea6bb75ee3d06ae SHA-256: 09305065888f7d252d508e96ceac07af8668efb4d6f82544d1682b4fa3f41a9d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The presence of many unknown URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lovebliss.tw/UserFiles/files/fevowuvavoxutosopigelem.pdf In PDF document text
    • http://vistobrasil.net/uploads/file/56044411908.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/89683990699.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/36001342895.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdf96db2e---84317906780.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109060707447257.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/78875287086.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/likafamitobuzi.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/jugam.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_ACDA55ACAC45B3FF.pdfIn PDF document text
    • http://nscenter.cn/upload/files/kulenivukimavozus.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xotetirunipab.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/70929756642.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/80536243963.pdfIn PDF document text
    • http://rhondachem.com/d/files/34284148115.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904111636.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mirobufilefikutetujivikap.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_C50300DAF913F9D1.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/nixuxowetajuk.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/63728935444.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/55815153624.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a5b91fdd---bifebekijejelunusu.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/67287167067.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/59899502635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+4+pixel+experiencePDF 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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10352 bytes
SHA-256: 905b697f4bfc3e33229b6f94c554c3fa8c1f16c797b3a00b4f0b5e57f39d1da0
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 18588 bytes
SHA-256: aecf0ee6e726c20b62d8fe1c5f97244db2a23758185d34a07aa75a8020a2f3c5