Malicious PDF — malware analysis report

Static analysis result for SHA-256 35adbb5b36af6005…

MALICIOUS

PDF

86.6 KB Created: 2021-10-08 19:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ef454ade8ac2c1b999b9229fbb9e679 SHA-1: 1b0526a7b43da84a15a6f7df90b56e63b84b04ef SHA-256: 35adbb5b36af6005622e42d7baab36f4e975c5a41ddbfd6f72d2898e82d34081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=multiplication+of+vectors+cross+product PDF link annotation
    • http://inistor.com/ufiles/files/kupes.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/57960093392.pdfIn PDF document text
    • http://195exim.com/datas/files/98708437421.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/16894590484.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/24934788054.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wexurupese.pdfIn PDF document text
    • https://ahha.az/userfiles/file/wajepimemidiribuwub.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/fodizigarudok.pdfIn PDF document text
    • https://datajournonepal.org/files/44060094354.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109140100577654.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/22397992404.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zixitapixiripa.pdfIn PDF document text
    • https://birudongker.com/contents/files/77380642835.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/potigi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4623233e4---55219940116.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/27276996302.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/madiravedigumav.pdfIn PDF document text
    • http://pasted-radio.de/web/files/menarafegekul.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/samexutasuboza.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/teluketusiruwezugiwaweri.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/4608443035.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/vadawakoti.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wevugupifafawajomosirupox.pdfIn PDF document text
    • 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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10772 bytes
SHA-256: 1694a35242a19af3bc96133232797e5bd1fd53a648548f774fe9a48aa6bb9815
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 21996 bytes
SHA-256: d07a2d0ad4356682931364d4929d103977f2bf08b028b7b02417b5cc4d833bba

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