Malicious PDF — malware analysis report

Static analysis result for SHA-256 28444bc6faa3125d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 05:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c458d6b6241e9fa07f6bbce2be6a64f5 SHA-1: 4d47e39b4a55afd0f62f9343aacdd301a1dffc04 SHA-256: 28444bc6faa3125d597ed2981b340c2f44cc6258868274888ed41b03775fb08a
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful 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 http://kjphotocon.org/data/userfiles/files/pawixijozipovasasotafu.pdf In PDF document text
    • http://asiadomainstore.com/userfiles/file/18423769097.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/mowasaxumojun.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/55474244396.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/91499007110.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/73519300369.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/35675071638.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/40219829137.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39898060727.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/070644175721.pdfIn PDF document text
    • http://precisao.net/files/files/tifoxajobomidofe.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rixemixoko.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/18903621749.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kugesenefosaxiziwa.pdfIn PDF document text
    • https://angkalaris.com/contents/files/fiduwusu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/53104053709.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/vidovezexogugugonifon.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/40223925124.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rizubiwavuv.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/55969217626.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62887492225.pdfIn PDF document text
    • http://boldogelet.hu/media/9493933367.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ribunaxisakuwuxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+walking+dead+mod+apk+season+1PDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 17960 bytes
SHA-256: 1179c49b7b673bf104f1564020d92f2dc3df43d575267fefa7e5b0368ee19b22
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10836 bytes
SHA-256: b58711088a26b4a60246239fda4abbb0a355e31c513596bb7bf61011e41f4ff1
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1