Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c792499bb1a828…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 17:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a388b7989133359bce4efdfd3cef19b SHA-1: 8c04aa800b4bbaeba91e7a924f100a50a5b38408 SHA-256: b5c792499bb1a82812b8e07c0e5bff22072e8e10c1e9153f72c47d1cc5891800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://chikatere.com/Upload/files/zidoladeni.pdf, are likely intended to redirect users to malicious content or downloads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chikatere.com/Upload/files/zidoladeni.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143267ad2bef---74632253008.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/91629968638.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/12948289632.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/84023173180.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/makosazaregepapulijitug.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/mazipidal.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tudupetob.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/dejemesirigife.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/45090680082.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1vp1ab4gis3n7fvolurpn92hco/mumirexaxiva.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/57818528195.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/kubido.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/jozomogitalufozibisido.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/62769392902.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/roremugejofotoko.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/36747331379.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1679743542.pdfIn PDF document text
    • http://7profi.net/userfiles/file/zojigevigizivelipod.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/83994132903.pdfIn PDF document text
    • https://cubic.is/userfiles/file/73266819063.pdfIn PDF document text
    • https://securitydm.net/slicice/file/79027424347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+movie+app+on+filelinkedPDF 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_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10768 bytes
SHA-256: 9596bb46a304394972df00fac86e09019daf2e1fdc837e08f730f5693ee945d5
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 19656 bytes
SHA-256: 3124fe693515342e0d647ddc64d9e25128b5412bcc0963b6bcea3640511481d1
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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