Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc1d16f1ff04017…

MALICIOUS

PDF

68.4 KB Created: 2021-09-11 21:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 209e1105bf432412ddeae16a5c31abd1 SHA-1: 7bedd9432c0b984f6c3da93f80a9887acb34bf7c SHA-256: 8dc1d16f1ff040179f82af9a0c4a8f71596cfa0b2e95e4c0c24526dc511ced33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=legend+of+dragoon+ps1+download PDF link annotation
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/gawaratamunekeluku.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907160304137297.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/74783887644.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/38237364119.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wijibi.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/8184416482.pdfIn PDF document text
    • https://negaratoto.com/contents/files/13765899345.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/11431373387.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gejozetazemutovovu.pdfIn PDF document text
    • http://berbun.com/user_img/file/53981865239.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/nuwovubefevolorawotula.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/bamerajifutewu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tagisaripod.pdfIn PDF document text
    • http://samtle.net/ckupload/files/jagasalufonetexigogofas.pdfIn PDF document text
    • https://papiratisk.cz/soubory/berusalemugelovevutuwe.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/fizuvuz.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17870128485.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175bc2f9a7---36289482799.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/6204079414.pdfIn PDF document text
    • http://ladna.pl/user_images/file/togujobamowojam.pdfIn PDF document text
    • http://stl-hk.net/userfiles/21015351562.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011058e18d---81518883415.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_off0000ade4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 14984 bytes
SHA-256: 9ed022ce986b77de93c379d6035cf421bf72ec104c33f6d701b49a1ea4d00cc7
font_02_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10580 bytes
SHA-256: 384fbc27810edb6999148029c0659d96ffe93b0f09bc4eed94a50f6aa06bdf63