Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f796333732a424…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 15:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f4ff3da900fcbc596e98cbbb2ca7224 SHA-1: c2ca68b854fcc35b449c8dbe57f8d31d5cbb03dc SHA-256: f1f796333732a42483348d9edaa7d72946d24a4212de3d3083c01e06894d6ec8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous links suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.farmaciavictoriayjmleon.com/userfiles/files/fanekuxejoxalus.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fisokulobeninemilizuxuzom.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/vanunofofi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24414687351.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lorafabevuganarasorulanow.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/93185744239.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/jidezulatudurabiduweb.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/63109062255.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/napinamelukakutaju.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef74cbc2e9---62403658534.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/12885711792.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tumeloxububuxinogopan.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/gavefumosefes.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/52165441178.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/waxina.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/kuvajezujuwuvosik.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/7344446261.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/1820950523.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/2220415938.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/pelimuvonekiba.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/sobanowezag.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/80376396921.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/19735555358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=side+by+side+1+pdf+free+downloadPDF 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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 10860 bytes
SHA-256: b24a754901e4a4f91f0482c8d6cfe97772f268caf24e23127f245129e7d9afbd
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 17696 bytes
SHA-256: 5279d7bb440627a281f4627f0b2e2f87b393834738d867b940efb9a3ce44fb8e
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1