Malicious PDF — malware analysis report

Static analysis result for SHA-256 7869d227a75e0af9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 17:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5b607a2762105a406599d9c42cc074f SHA-1: e58c73e4b15d64c9b66cfc319966d57caf799428 SHA-256: 7869d227a75e0af93c4cb01f9d7af27e9145faa0efee69d7fd2eadf71ff9ef08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kaymccarthy.com/immagini/file/najovitirakumor.pdf In PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/87946151396.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/62769235261.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd54de356d---61176527348.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/83258757862.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/45670602477.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-16/20210916061135326619.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/51718186055.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pejuligopedaxakisika.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/70462671368.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/75632801638.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42382545264.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/15119287042.pdfIn PDF document text
    • https://terracell.info/images/file/43855486143.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135974cc0564---laxedimik.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/mejavunejavutulamusefi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wumafujideka.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/dowekitane.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/53859274144.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/xutupoxasodetiwixojom.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/33247616813.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/vakadopesatesam.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/4366991131.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/57153827769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=excel+to+pdf+converter+onlinePDF 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 10436 bytes
SHA-256: bf61ab810021b09b385360a432f1c96861b0461d46e4862dd5d0b2a41da4bd8e
font_01_sfnt_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 16184 bytes
SHA-256: f366de8f7052ffaed60e795c59e3ced090541e072393d43d0adda1588b87e531