Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbfda9a4942b270…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 07:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 439ebc2907789ff5619d29ed4949f99d SHA-1: 8a31f9aa52f703ace5a955f811fad975ff59f4ef SHA-256: abbfda9a4942b270fc17d0165bdfcedd655b0ae2099ee1994ba3507819d36b8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://ijfbacknumber.com/editor_up/64688900923.pdf In PDF document text
    • http://hyundaiokla.com/uploads/files/13112011895.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/xibosemuforikevototoxifuj.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/fokozeduvape.pdfIn PDF document text
    • http://gzwep.com/img/file/20219834659.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/55250117827.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/momofadujovifezesunoro.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/vunevepimo.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zuwenosep.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/35717271308.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/59344989577.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o462jjv55cfri0kl05r2ne3fhj/53693041511.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/98963677713.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/59507674489.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kesabefetunok.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/wative.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/40466409012.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/vobibugelelotak.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/jigisuverem.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/jonunes.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/47345266743.pdfIn PDF document text
    • http://hiniceshine.com/upload/kutaw.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/muwedopimapakepog.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/72766967800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+send+a+photo+from+your+phone+to+your+computerPDF 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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 16888 bytes
SHA-256: c46e3b3335af4386fa0010c05717159a12eda385a44e8f082b4893e5d1abe34a
font_01_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 11036 bytes
SHA-256: b7e1f35fa49d203f773ca9c99cd6f089c3a2a0ab7611f557e67a0d4bb0245cd9