Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f1d75d8ae4ddc2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 09:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43daa105271d167fa8ab3364187ddc6f SHA-1: e79452804ac49401817b175c032c3eb1b1d72e99 SHA-256: b7f1d75d8ae4ddc23bc5a31e8c15e652957a80eef0db5879864e86a10112c3f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for distributing unwanted software or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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 http://bernendorf.ru/userfiles/file/66771252541.pdf In PDF document text
    • http://cavusofis.com/images_upload/files/lonibaxupiduwumak.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/petemoraf.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/62453608872.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/pexubejirumosuzibobin.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/79924455405.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ffe4f2516---42884401195.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/naniwosaletokexosevutukuk.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/62847143247.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615235cfebf27---26190040668.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109101224119291.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/raripozajizeponu.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/lumeladiv.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109160444108592.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/pevomudirekekelut.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/68169806010.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/49037117373.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/38680697022.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/82242437640.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/71968594364.pdfIn PDF document text
    • http://youil.org/userData/board/file/zasepigutesafirexomag.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/kewijatekinoverawojid.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/giwiso.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/73513257056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+platinum+free+download+for+androidPDF 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_off0000b439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 10772 bytes
SHA-256: e60bad60147ab5d03459c8b45678264726ed915e47deb6aa0200b9eedc91333e
font_02_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 17324 bytes
SHA-256: 16134b70f35a038ade2cf7cdf375db95d1b143d1415632305752062106f36842