Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ff6bf14887703d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d50245fd82ae3ca32407f0b15079f389 SHA-1: bcf79ea89128027110cbb4faa8f4f18b31e6aca7 SHA-256: 55ff6bf14887703dafe75219d74b9fd1b60cf06d627eeffd92ef5a4e680e2df8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs that point to various PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware. While no scripts were directly extracted, the presence of numerous external URIs and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://susasoft.com/upload/userfiles/files/gegipewimijivisegapo.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/431fc165b7bec7a012ebe5aee7160428/88777886377.pdfIn PDF document text
    • http://zl369.net/userfiles/file/97728912111.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d9388dfc---vimave.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17194381927.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906140454740564.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/50752470415.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tovozelirusasunuka.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/72025191480.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/lipogoputad.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/midewodi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/punedirenot.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/85301469237.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/xabex.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/53814258555.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/37180759965.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/68593451518.pdfIn PDF document text
    • http://szhlfz.net/upload/bumidurujinagogiv.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/nagarenuwituzimure.pdfIn PDF document text
    • http://gestioniarmatoriali.it/43244500876.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/feriveluxa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/xilosopetepikejejekifeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=netbeans+apk+downloadPDF 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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10488 bytes
SHA-256: c15574251089d9c2f9b40eff41adec1cbd486128890023eb5fe4a475c6907606
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 17888 bytes
SHA-256: 211ca0e817bcafd292f1eb0b0c1891b5aa23182aab5f9e0fb3a5b10bfc67238e

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