Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0561a1fdd856204…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 18:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 775864d3912aa21ad8b6d8f58fee5f80 SHA-1: fd848edc128929842309bafa485004d624825bda SHA-256: c0561a1fdd856204bf0df103e192a93d04514c69a51e2df0db43931644c80b12
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://metallpress.info/files/66962650417.pdf In PDF document text
    • http://mamolenasnc.it/userfiles/files/50847452331.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/10125401733.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fee3d72f6---kodarefogugijafu.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/kujototezatas.pdfIn PDF document text
    • https://ienter.bg/files/89782501029.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/10431095299.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xuxagodijisolixev.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fisazifalonebidor.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bedisowanifarimuw.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/53215728255.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/gubijizugigitixa.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/13333927832.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e7fa4418c4b0dce3df681e8a580ac6f3/76093749659.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/doviferawemepazomiridugib.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/pitemaxiz.pdfIn PDF document text
    • http://trieuduong.com/images/Download/40051752382.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/banepozosupatewobabo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/rarezirubasupoxogimeju.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/panisolo.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/womurumizisuremotazixod.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/86833442475.pdfIn PDF document text
    • http://pasaru.com/upload/files/74266489896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+access+shared+folderPDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 10456 bytes
SHA-256: ebce00c99cb67ca32656f285d6f01c690f58d9a0eedf4dd8eb876ab57f452d20
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 17348 bytes
SHA-256: b2d581f6106368358effa86d619d6f06a9a4768d0968c064cfd0eab9a3938fb3

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