Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8abb3a444d73cd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-30 12:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 255583d03511b8170ea57fa036ab8124 SHA-1: 6947b25b8e9704b86c92e297ce9c2ef79803ec86 SHA-256: 6e8abb3a444d73cda46d808866951b82c53a121ab5f62dc7d0e74e1daa807940
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains with unknown reputations, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://dodogs.ru/sites/default/files/file/9780122844.pdf In PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sezarubasuwafubejeragutal.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/16983085247.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/44958079409.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nizilaxirozuzoxa.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/290517069540.pdfIn PDF document text
    • http://vejwun.cz/images/wonogafigumitejazene.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/44704457565.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/koxoba.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/wizesopezotafino.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/42310759656.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/fijufa.pdfIn PDF document text
    • https://fitness-base.tw/uploads/files/202109250051121929.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918131547009.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/fusukuw.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/86429458810.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/rowedinilug.pdfIn PDF document text
    • http://a-pluset.com/userfiles/mikoziwizifoso.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614079b222e3d---jipixamemaked.pdfIn PDF document text
    • http://foodchemsino.com/d/files/vebenetiti.pdfIn PDF document text
    • http://pinxedien.net/upload/files/74901504896.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/98b86daff93492bbe74c60e6cfb1fe71/15980705148.pdfIn PDF document text
    • http://ruihuitax.com/files/file/50507791343.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/54592279846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hack+wifi+with+android+phonesPDF 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 19180 bytes
SHA-256: a8281a13f1e269a0805a2024b444fa4fb4573e638ee17e19ba782dc3da513250
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 10840 bytes
SHA-256: 0b1874398b3c04772c892c988e408878a7a4ea68e9487a2350e8510a667c6b4a