Malicious PDF — malware analysis report

Static analysis result for SHA-256 f971203b075e3ce8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 11:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc69b9a66acdab9ddb4847969187d640 SHA-1: 88292afde1ab74a2644d6f0f417c04b4e2ca970b SHA-256: f971203b075e3ce819734e927dc155a9f314240759fc6e03a2779681235b9011
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting and are algorithmically generated. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jenan.com/ckfinder/userfiles/files/nevelanasarodigabek.pdf In PDF document text
    • https://ceral.pl/ceral/pliki/file/lizatijimamogikekum.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/30581772543.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210917081205.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/50881470577.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/34393674545.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/3132249014.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jopibebu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/90602997424.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021092807372727.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nekomate.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/musosor.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/74756396961.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fepawidufikudolodikir.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/kafunegutotudovure.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/jovoxopovikapebanipired.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109102208553194.pdfIn PDF document text
    • http://xhzhengli.com/upload/35450934177.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/30406509171.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/94983023197.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6e4aeb7f---kefemu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/83888111975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=name+the+planets+in+order+closest+to+the+sunPDF 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_off0000ae89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 10856 bytes
SHA-256: 2ca39028d2cceb9eb61a3ce76dbbdcbbf3e7edbbe478ffcf565d38713e707e68
font_01_sfnt_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 16300 bytes
SHA-256: f99df6a24adbebd0a5cadfff27688a7c1e52b74e3ff174203762be9d5375bdfa
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1