Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1714a502ad585fb…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fab46db131573de5adf984a5d1eb4918 SHA-1: 0dea68c80b2690233a5820c528a3d2e0a796b5c2 SHA-256: f1714a502ad585fb1adade4a346c0e1f1e08d3e1e3abc4e198aabf8f79ca9964
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://n-production.com/upload/fckeditor/file/52195171032.pdf In PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/19010792936.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/62682618978.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/fimuxinunonik.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/55027511551.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/33463953668.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/juvebu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138b66325861---gebug.pdfIn PDF document text
    • https://termofriz.rs/files/15562469000.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/waripijutosinidote.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/tedam.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a778ccf---26552596801.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbb35a5c9---13389802783.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/petiwivonimuvuvepabuf.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/91992938234.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/dononuluxudebular.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/36321352146.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zirusuretemikowedizekiga.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/fazixuzob.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/gurevagoribe.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/6442353078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spin+master+game+free+download+for+androidPDF 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_off0000afc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC6 14976 bytes
SHA-256: e208b634e4106d8721d72f89d067b609c48d50c3c5734c24400a31397fa0ad5b
font_01_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 11004 bytes
SHA-256: 31076e918d959386e72cbf139fec87e07f0de41a19587cfebec34d5fe6075fbb
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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