Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8531e67e9f63754…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 23:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d572cbb0024013b2651f522836eff76 SHA-1: 9f856ea33511624433db63a0f954e3058747391a SHA-256: f8531e67e9f63754dd1a735c68e567e825970bfc2a2e578aaf8f796e36517fd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sibconsulting.com/contents/files/zawutixusesavuf.pdf In PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/28360243118.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kedenesazekovaxowo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/79475172743.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/57879560674.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/fobagoj.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/sowotaxinujo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef460b2076---duxupotixagadogibotug.pdfIn PDF document text
    • http://poorclarescork.ie/images/xatobij.pdfIn PDF document text
    • https://pcetravel.com/files/file/gizer.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210910003437.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/1383692338.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11251730393.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/061458332369.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/28445582347.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/pukaragixuwopetiwisosijo.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/tawonajiwijuniwowiv.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130758210910---83214850391.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/76654706022.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/17233459582.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/57793235554.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/pidobafuferuvujezolosulax.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/gufobepufokufigigajaji.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/xupotavamuv.pdfIn PDF document text
    • http://rc-modeller.se/images/file///ravepevutobaduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reset+android+phone+forgot+pinPDF 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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10776 bytes
SHA-256: 72c796fc92289d83885b90bb0a40fea15107c8ee57afde521a843059db7b43de
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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