Malicious PDF — malware analysis report

Static analysis result for SHA-256 599ddbc67d36cd1a…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37dcc59e46e7787bdf7c884c163e11f9 SHA-1: dae554c8a72a6f1a593be6e4642ae872b55f54a0 SHA-256: 599ddbc67d36cd1ac9506d765ccc94c80efc0a937df965fa0580ee6bcf1ed57b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true destination of the links.

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 https://pistant.ru/uplcv?utm_term=essential+grammar+in+use+spanish+pdf PDF link annotation
    • http://jucal.es/images/file/wakofozigunoladizet.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210912_122605.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/2324840908.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002cb9ed22---satudojamum.pdfIn PDF document text
    • http://humanconsulting.cz/media/file/mesofufume.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109020555509364.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/42992305631.pdfIn PDF document text
    • https://loyd.rs/images/file/merelukegalonajelowiwapix.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/18186709039.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/gufeti.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/87101979552.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/53413055385.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/83e5c241adbef4a7a54435a8dcc03689/99522524239.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910132458.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/janesiruratuzilopize.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/65211312328.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/72357302755.pdfIn PDF document text
    • http://zxsolar.com/d/files/mekoxidupopukin.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/8562325449.pdfIn PDF document text
    • https://digicpictures.com/downloads/86362464812.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/robopulu.pdfIn PDF document text
    • 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_off0000ac19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 14580 bytes
SHA-256: 7bc097b38bfda1eccdec9eea5fe82b358c1e78016a2f9e134ef26aec0af4f6ba
font_02_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 10908 bytes
SHA-256: 64245cc7561530cc612b7defe0ab08ea097939482466c5495c6283da730ca887

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