Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f09c22cce4af8f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 16:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 650e5330997af315ae18218babc57a9b SHA-1: 12a04512ae1787a3c2e6205fe4432c9634db72c3 SHA-256: e0f09c22cce4af8fc15263e773634c400afd20db6c590cc6d009f0f4d7a96c8b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to compromised sites or download further malware. The presence of a link farm heuristic further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://selispin.com/calisma2/files/uploads/71785923886.pdf In PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/segunusugoxewe.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/webeganoliw.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/pegani.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/giporis.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/55158980211.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/20264747714.pdfIn PDF document text
    • http://termocity.by/pics/files/vuzabukojomimiz.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/25388298241.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614038a3549f6---tezaxumojixi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/37131489025.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/xuwukotoxo.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/rexuvotawomojov.pdfIn PDF document text
    • http://iscelenie.info/files/file/19034258310.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bugerev.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/numisibepaxokasu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/riboxo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72105121090.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/60433496520.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/buriv.pdfIn PDF document text
    • https://tch.lu/files/files/70341292324.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75408f545---76040859005.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/ganewenovavo.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/85607209590.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913115047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hack+instagram+account+right+nowPDF 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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10768 bytes
SHA-256: e92e0a60af79e4f2e8b3094624f38744fefbf8060624110afb4ab5c5e2f04a2f
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 18644 bytes
SHA-256: e5191dc60402c830112d4ec19585fbce1525d1323be485c7206a8be27b8a0728