Malicious PDF — malware analysis report

Static analysis result for SHA-256 452a2efdff9869b5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 13:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 36c8000bd2ae610fd3b6b746bd4ae705 SHA-1: b33ad781130e9d51b509426b5aac5550ad64f4c8 SHA-256: 452a2efdff9869b5d3cad688f6b4c8f899dec352508b74cf175ff656f0377b50
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of external links pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sunsetlearningcenter.com/userfiles/file/geliluxeket.pdf In PDF document text
    • https://istanajpdua.com/contents/files/ludironivulepapigejilupo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/muragumijo.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mekiwuxi.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xogidoseboset.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/mugiguvofafo.pdfIn PDF document text
    • https://atlantidegattico.it/file/22455698953.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rexuxixijeziboxu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d332437a6---81961794682.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcea8d1eee---10029803890.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/53453514195.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/mowupagatamabojojekefizu.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12233620638.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090506153573499.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/robimitademozasobi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50176282354.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/puvonomakozagupafonos.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/8093704406.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/kuvoxozowudo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tesasararuj.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/votezajinuwetufitaxodufi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/rolevepekav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=i+have+a+dream+speech+full+text+pdfPDF 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10788 bytes
SHA-256: 8762208d95be7a2c8dbd3fc70b53684b30318484778df97fbe7783cdb3fa85c4
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 17544 bytes
SHA-256: f10d021dbc294da47c652331c06bdfb8ee5651d75a2013644a6630975c51411f