Malicious PDF — malware analysis report

Static analysis result for SHA-256 14eb380e827fe635…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 02:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf278a081f58a51490c88cdf110a24eb SHA-1: 93bb71918a9ea0f7d1be4ff885d3f860a54dc6e6 SHA-256: 14eb380e827fe6358b46c412e328c6efd988d5aa71ed1e3b4bb6f9857389a0fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://chung-pei.com/userfiles/file/legorifudokewegefal.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/jobisixaxok.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/nelamefu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/93926998147.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/2172305775.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a313d73503---gamapisizilotuwoluwa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b7e60067---wilufavukizinevoluwixaxos.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/gesevibafetekarodosed.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210911140207.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/pinijexazubutabavave.pdfIn PDF document text
    • http://ed-union05.ru/files/file/88237979164.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/64496430695.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/87623402080.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/domoduvumoxuvig.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/88427290076.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/nugoxalavaweduzaxil.pdfIn PDF document text
    • http://sangiaodichlaocai.com/upload/image/file/94490126293.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/sajalokoketutebonixifov.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65358310563.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/tadovupitaliluvaf.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/30641187082.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/zukewadaber.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/84226396725.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bizakojoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=eroge+games+mobilePDF 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_off0000ae1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC633 10372 bytes
SHA-256: 330f274598f71bfb5324037b55e9d801a7ee73bb950abea77438da55cb52e373
font_02_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 14640 bytes
SHA-256: 73c4bd20809793fc49fec69cd8e1a2ef2de0328c5b2db0dc8420b8a2140aa73d