Malicious PDF — malware analysis report

Static analysis result for SHA-256 94635b32cbe3b0d0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 04:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08e457dfde75ff7f077b8f6717c2ee94 SHA-1: 7512bbf838d459fe06cea06ef67248abfc724b91 SHA-256: 94635b32cbe3b0d0dab40fba92fee6190f9ee330cc9502c05cb70f47af7dc387
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, suggesting an attempt to execute malicious code. The presence of numerous external URIs, many pointing to potentially disposable domains, indicates a link farm or redirection mechanism likely intended to lead users to malicious content or phishing pages. The heuristic 'SE_DOWNLOAD_BUTTON' further suggests a lure to download something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--hjrnskadeakademien-mtb.se/userfiles/file/44089659961.pdf In PDF document text
    • https://advance-pack.com/editor_upload/file/saropuxutegivepanalukolaw.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/suwizopojijikosebifoximo.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/kukusevir.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/lotomifixarijugexi.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/18797408306.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/681293332.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jiwul.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2521068328.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/xuvamawuzizonuxadoxexoral.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/81407246392.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/18952759014.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zexepopufimirewikiwapada.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/fawaribojidekuxomowowilo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907002117428020.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e973d5818---daribuzolexam.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a25803145544fd443bea0fdceb6af09/notivuriw.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/93307610441.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22933784871.pdfIn PDF document text
    • https://bunianco.com/other_files/File/biwugukuvilalenanavabuva.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/sopoxesobol.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gusorulezinurawez.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/bunafevekufiwufi.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/12185080748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+install+windows+os+on+android+phonePDF 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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 17672 bytes
SHA-256: bd60e057c2c760d1cb796541b92542d03db625528df30ee024917bb88c73095c
font_02_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 10568 bytes
SHA-256: 22a6b052cfe30701232bcadeab51ff694f3ee6dd8a9c62798051dcc7cacb9a68