Malicious PDF — malware analysis report

Static analysis result for SHA-256 436f226c6989b2d5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 13:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 053dc9160963cbf0acd7fb7548964c81 SHA-1: 6c570c71b9304394b256ff66ae786aa47b4e2b36 SHA-256: 436f226c6989b2d50b52646c49e187ebfffcbef4dc908d23d78508abbb25b18b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicative of a link farm. Heuristics suggest this PDF is designed to redirect users to external content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://skpizzasubs.com/uploads/files/695040235.pdf In PDF document text
    • https://groupunsur1.com/contents/files/88061166970.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/lowigiruvalovijunateselo.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/5728437515.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909151921.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/80885165257.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/16988555423.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac7c2279a---57025832731.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146eaed46b---gabawuxugoxapate.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/tefafunamoxawemogamaz.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/komuwa.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/gakegujesovirexowosuzag.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/65281926702.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/1028635630.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/makelumakulujiwulotanoza.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19391075083.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/jutusadejo.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/96186118774.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/patugobad.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/37111802968.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/94367135662.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/60897457784.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/71487975394.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fosedenifinulefedof.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/89384470008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chrome+flags+dark+mode+windows+10PDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 11088 bytes
SHA-256: 00ba7f2de46bf79d1880ee0de47e54f425bf31cfbb0791083c962d38e301f204
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 17796 bytes
SHA-256: 1f0b58cbff9b7a8d9d7c4126126e1769790983b8c4ab7c9f179b5adcd84dd850
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1