Malicious PDF — malware analysis report

Static analysis result for SHA-256 7458a36448bda097…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0dc5d6c9a1f87b82bca4f9a079a5521 SHA-1: 13b9bcb5e6cef2f4fe3caf9519ad4825a953593e SHA-256: 7458a36448bda097ec7768b47e9b715ddac4f0d54be92d3035c99795c30c953f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious download or redirection workflow, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hillsdalehorseboarding.com/ckfinder/userfiles/files/46189890390.pdf In PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jiwapuxisawunuwa.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/guwezipa.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/pumuzuvapimuwilatomu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/xorojitibarerukasofika.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/55242489489.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/biziwo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/petexajinizoxotibisodura.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mozubokojiriterilizetew.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df6323d98---89378628644.pdfIn PDF document text
    • https://inarsindbari.org/uploads/32608304060.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/67821518.pdfIn PDF document text
    • http://osayit.com/images/file/laxonoladirizadaguwalat.pdfIn PDF document text
    • http://konberdbio.com/upload/files/48602168486.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/53437998199.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/komopiseseme.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/25135132709.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/vovinerimisokanesezugi.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/28658859875.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109070228141669.pdfIn PDF document text
    • http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/varewovixig.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gutorojixudub.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/10117098447.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/823300ce06aabafd57aa15276873219b/92962499989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gcam+7.3+for+redmi+note+9PDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 10920 bytes
SHA-256: 8ad6641293b132b83e37671394d9d86027e6db5278cc016f7ba59d445705e2d7
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 18504 bytes
SHA-256: ae013662480e21b1c0166bcc8450cdef15151f1cdea2238866a38bedb46e3679
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1