Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7d0319d2e4f006…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 940c12d0925780d701232d9fdc9d1591 SHA-1: bba890606f4776234ccec83476b14146a6d6c1b7 SHA-256: fd7d0319d2e4f006326f33e6eb344130a527c348d93940ed72b16e7db3c99eba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cicadit.ro/UserFiles/file/49544819811.pdf In PDF document text
    • http://suliaok.com/v15/Upload/file/2021918519126681.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/14646915684.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613340b2e131f---tafujujunu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vunomiz.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/gezuzesafirijeda.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/52906995097.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/754293851613027a315bfd.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/33463360709.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/vavifa.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/1996602685.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/pagojisolesanoriru.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/vamifomugakawag.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/1548128574.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/janejeguvamotesiboredapof.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kugiviredate.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/periluvem.pdfIn PDF document text
    • http://sergeybazarov.ru/file/65693648617.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/78123512193.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/55264948395.pdfIn PDF document text
    • http://afro-safari.com/upload/files/10874650296.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/32764962598.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/37874451746.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/3038006871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+an+mp3+from+a+videoPDF 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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 10852 bytes
SHA-256: c56e58077ddb8043d993a78a3add7d8c30c5888b5c0021537ae3c28b7842b5c6
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 17080 bytes
SHA-256: c38b5d1e25d566c472430311a8956b4eaaf074c761777d444534ede859f49f45