Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2e3f8b613cf88f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 19:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44c4da134d679929bc89c0ca5624e4b6 SHA-1: a57f94e6e91f7721ab7f4c45fc675e8907a964f6 SHA-256: ae2e3f8b613cf88fab4df5df42df61341b2b5c021d9623cae4963c07d1ab20a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to various domains, flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

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 https://nomortiga.com/contents/files/18475305358.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/dofezefidekokogul.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/42171439275.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/47181423999.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubeximijuxod.pdfIn PDF document text
    • https://triosms.com/userfiles/file/58256024615.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/nuzatizuzefax.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/koniwonowasuromulorexefit.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/96573097635.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/37608048695.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/3231631302.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/26036678678.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131155146e08---gaminexudu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/figelibozilejefes.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/12055579870.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gurununitejojugosirasajik.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/61670549400.pdfIn PDF document text
    • http://alkanboya.com/files/file///dukituwupasopozoz.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/tenosanavimibob.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/72135947143.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/20855467767.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/91094244582.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/kusexirenunisojibowogi.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/sigazarapasabikoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tower+defense+android+2015PDF 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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 17892 bytes
SHA-256: 550241238d5f5cbbf4d9fa97e760fbb22f95540be8e0b6176140fd3863b5bf7f
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 10680 bytes
SHA-256: 9f55530cc8d99e4b9039c6133e8bc1a2827a81bf34e585468f22911f402eb919