Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d84b226ae81737f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56c37fe0c9bfc09d3e0cffb280d7057e SHA-1: a4d664136675bcfef627ff15e6757417fe5d0077 SHA-256: 6d84b226ae81737f3bf0f0803b469ecf6aa53e64cb58c11a22fba44fc91a415c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable URLs, including one pointing to a PDF hosted on 'amezdigital.com', suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1b352217960fd557a21b686ea5847117/fofimilugonusuzafub.pdf In PDF document text
    • http://ashioke.com/images/library/File/gifawobovinusubixojew.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/riminatazovutipaxikelad.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nuzosininaweruxamagiruv.pdfIn PDF document text
    • http://ore-processing.ru/d/files/wunuben.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/7527693902.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba779fcf---14233244131.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/doziwuro.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tiguriluvetowemeliluzum.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/14573052107.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091706384269.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/4443088798.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902160212.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/52430296699.pdfIn PDF document text
    • http://seamacros.com/upload/file/wunelajinebudawemuxof.pdfIn PDF document text
    • http://delve-cr.com/uploads/74297332828.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/15933939924.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/69731309282.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/13565009519.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/97913029404.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/jimesamawinafipematav.pdfIn PDF document text
    • http://chineseclothingonline.net/File/minibelorenu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/gikunakekugej.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zobevijerasobebug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=video+converter+for+windows+7PDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 10432 bytes
SHA-256: e3c292b91d4446f57beac93246e7576e9f3181fe150d2d8fd326e30e1fada273
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16808 bytes
SHA-256: 9b1d806978c7dfc044ea47ad776a8f21898bff50c4743e31ba97177aa3e5f73b