Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a2d7f15ffa3c75…

MALICIOUS

PDF

67.7 KB Created: 2021-10-02 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7e2bd13018893cbf19a40f4264dce58 SHA-1: 96d074a7f5f6774df33af7d6ab1bc3396047fa41 SHA-256: a2a2d7f15ffa3c757206269fb8039dda7411bb7df1575bb5bbbcab9eab7d13ec
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, aiming to trick users into clicking on embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous extracted URLs, many pointing to potentially disposable domains, suggest a link farm used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.champagne-cornevin.fr/ckfinder/userfiles/files/bumipewa.pdf In PDF document text
    • http://cl-pub.com/files/files/gajejofololobusisupovu.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/ratuvefadexokoninex.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/54502356563.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/69bc3a23d9e7eec2d191ccc495830ed0/82021088922.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/62375464678.pdfIn PDF document text
    • https://apra.pl/files/file/6037407254.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/33826402081.pdfIn PDF document text
    • http://elma1.ru/!upload/files/pogarad.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/lexozanotokarinajulefogiw.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/vuxojisoleku.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/jawolawatonu.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/disazagawofebowobuzej.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/dulikizugor.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/tilijilixetakonapaximifo.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/62508753492.pdfIn PDF document text
    • https://majubesar.net/contents/files/92276619128.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/tepudesoju.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/33038191562.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tewedo.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/memilekonukirof.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/kasapufenekufepoluzapuxa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139484f8564f---52389048045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=about+turn+crossword+cluePDF 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_off0000ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4E 10416 bytes
SHA-256: 02d5f3411c0a9c46eee8aa60a512fb2a620d78bdba537a130c2e9ca6ab412a19
font_01_sfnt_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 14168 bytes
SHA-256: 2ca4eefa1e860dfe4b19baac193b55c8122d1e42aa4ebc525e8e7017df737192
font_02_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1