Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba335918399a6d4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 04:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7d73810f0a73e78609827b4e7dfc4a5 SHA-1: 5a3e264853e345ed9fdec0eb728479df1c844d27 SHA-256: bba335918399a6d43e9da6a2b255712a5cd40a89b5182fa0d8c5dbe415c82df4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://malir-naterac.info/UserFiles/File/6926935567.pdf In PDF document text
    • http://elateridae.com/images/FCKeditor/file/85772059628.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/turarujoloraxavowiketo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fovugenufixumafuboji.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/5232917556.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f328389db3---fupajageruxakagi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/varebitaduvizapija.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/suwirubi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/jetijizekuxonur.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/12253092089.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73650089821.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/bevevemibemawipakuzatunab.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/95293642248.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/jodezalibijoporufeni.pdfIn PDF document text
    • http://e-sheremet.com/img/sajoxesefejifalakavaso.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/46415031464.pdfIn PDF document text
    • http://mcutech.net/files/98450274830.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/kowep.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/xizaxifobisivuli.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/20349354953.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/digolinimapibonatewig.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/81558195648.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/54275288354.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/wuzavufiwefugesubes.pdfIn PDF document text
    • https://masukpt1.com/contents/files/24712964307.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/fobarufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sms+cell+broadcast+androidPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 17140 bytes
SHA-256: 7ac4f2acc6400f2da19ad52ab75c66e66d7edff0123fd4c27756e29fac5e746e
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10748 bytes
SHA-256: 505b020e2667975c54b098e8dc7d95868b6392cf2ef2caa32d53ca6d0504ff3c