Malicious PDF — malware analysis report

Static analysis result for SHA-256 670725c395714624…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bcdb0eda5a714339fd6a7873029b00d SHA-1: f7c844e91554cbc405fb73f4903babf232736db6 SHA-256: 670725c3957146243f9bc28270e411905af4348a073a841f7e0071263364d5ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+streaming PDF link annotation
    • https://poulinstrapscan.com/userfiles/file/78484205025.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/41339599116.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/46899394959.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/konapepi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/45065327473.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0080114001631976343.pdfIn PDF document text
    • http://medrea.ru/upload/files/mawibefowiruzuzof.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210906152449.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/kujirenomenabesori.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/1152302380.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/galivozamabajuju.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/buvabon.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090416003494.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/66607392571.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/38670976854.pdfIn PDF document text
    • https://steammining.com/userfiles/file/batowonukiputujesekemigu.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910134316.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/43446325053.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/vinuguwe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06cd62a3a---viduzobaxakalezodoba.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/93966790618.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/93456816073.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceb24dbcc---zapisedufetidopagedezofo.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/84173468188.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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 11104 bytes
SHA-256: 623ae99b79bfb90e6948b40746565edc88a11da9f3f40332eb1d7a2c4de11a09
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 17160 bytes
SHA-256: 42dc2d496610b233353c94a0c60f5ea15ba98a461defcd91faf57d17fa4e7e8e