Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de4d31ca67e566e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 05:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 547c952ca40e7cd2fc5bb0175fabce82 SHA-1: 036a3d2362f6abf26601ee1f0d0d3a8f8c92b449 SHA-256: 9de4d31ca67e566e3da4fbbf9b917a8b8fede9879465a775966666bdb725ab37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a pattern of using disposable hosting for numerous links. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coeb.eu/userfiles/files/17256264226.pdf In PDF document text
    • http://lachambredechos.com/userfiles/file/verowo.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/jakelomuvakesokaguno.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/78197256122.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xigakozuvolujeg.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bolitesebikulilumigilen.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091007470873499.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/nilazukakiwogewew.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/fijadikiriverepemuwe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389f1f2a7aa---gaxofo.pdfIn PDF document text
    • http://0048.pl/48files/file/65911725507.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/50531377335.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22820371165.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pisumode.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/23437364452.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/xunotiz.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/76464337782.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/watofuzawitepa.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/30126131801.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/08vqus8he8hv37p5maa59da1qe/xafenevix.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/povobibufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kindle+paperwhite+3+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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 18708 bytes
SHA-256: 8eed5ec916c87eb7b846258d4d4d4e27474c26a9caeb2c028eae9b0f75f8dba0
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10556 bytes
SHA-256: bad1da36d965fdb6c5e8f7be1ae87b908349e5061d8c971921d39d11e10183a1

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