Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c622fec2a80729…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 15:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d3ce83be16f0e0769fd6c930a0dd4a7 SHA-1: 5b6cb56ba8d6311c04766202038e593c83144638 SHA-256: 89c622fec2a8072945962e8523c8fa84e2edfd4763c54c9678d6e6f5c2277998
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=clans+mod+apk PDF link annotation
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dubupum.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/sizapigik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b5e98062---18586655387.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/dafeguv.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/netogidarafopikofowikoduk.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/46595523962.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/82065314091.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/47869890161.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gakeloto.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa75a4a2b---radigububetim.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/fagekipin.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/botibuneborulimazekuwu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93655708659.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/73687920470.pdfIn PDF document text
    • http://freeorden.com/media/file/82597983286.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lijaloretulajivegi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fixudejudinatub.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/walewimaxafinabapubiseb.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/remevukawub.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/tofotibofita.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/30988278647.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210903160220.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/37023372839.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/21621582948.pdfIn PDF document text
    • 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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 10256 bytes
SHA-256: 56af29a93988e174b39da132779277a5baf3faeb1df288390d6473fd03ec69aa
font_01_sfnt_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 15696 bytes
SHA-256: 916ea0b2f58a4327dc6d84eaa1554f72c74bfb205e26d32183ebd00cfc5ced59