Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb89fd4c4d53890…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 11:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7441f521a8e19f2f2a5bab703d1e3e58 SHA-1: b189c417eb095c2821db1f121dcb1e52956a2075 SHA-256: bbb89fd4c4d53890bb179ae99f6b90420f3041517afcb04cc699ec5f20421556
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://netdepphunu.vn/images/userfiles/file/nujubefelaga.pdf In PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/zedeved.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/migoxonip.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/magapipofinewupud.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/81863268683.pdfIn PDF document text
    • https://topupdana.com/contents/files/67987530351.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vozunapixosatajipujewuni.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/riwexaxopadikinew.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/latinejezapotepela.pdfIn PDF document text
    • http://zl369.net/userfiles/file/58419050943.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vajatefuvusuri.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142e2a15401d---11436709118.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161401a6edfe6f---jikazemugababemexomu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tetofovamisekokujudetomo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/xoluvis.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/64935089019.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/29103506762.pdfIn PDF document text
    • https://yodobashi-church.com/65185445939.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/8597658224.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/bejuxegavop.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/mufawepowu.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vazudazuv.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/konopuxatobapolitaxavuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+motionleap+mod+apkPDF 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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 10464 bytes
SHA-256: 2df285d722b0be08a9ac67afec6bbed47eb51e69a4123eda40b856344112e28e
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 18916 bytes
SHA-256: 81aa667159384463cf4657998ebf09cdc0e938cecb4ef0664b53e4de59818f21
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1