Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb897a8d728baf4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 18:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5be588ff7805ba268c04bfc6f6e69b9d SHA-1: 7ccf830d15687079ede49885cbd9ee5df13aeace SHA-256: ecb897a8d728baf49de4f2877e7c0208e9764e2cb7ccbc1069aaf6f44de466f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=what+does+auto+sync+mean PDF link annotation
    • http://pyhunlian.com/uploadfile/file/gikizurupiweru.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dezaxadusa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303645db68d---55090192161.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/84422571154.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datapadojiroxoguf.pdfIn PDF document text
    • http://henca.com/files/details/file/6009156798.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/muluf.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zapigodofugubuwobewi.pdfIn PDF document text
    • http://strahyi.ru/images/file/kajobozikotuxap.pdfIn PDF document text
    • https://yifff.se/userfiles/file/12363995274.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/88469451665.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/minuxilasoje.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wabiguwekefegak.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/38143162212.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905014403_kht3ws.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/50824002519.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/vimizonasupewiw.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tokixesanazonojej.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/xiborapija.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/60390001249.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/20125740209.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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 18076 bytes
SHA-256: 0f5f3c1dd795972fc8578eaeef75037893622082ab89ba6d1d8391efa905b195
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 10604 bytes
SHA-256: ab961111091e75e443d477917a58d76bfa605e831bab26bea531378795d3c8ff

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