Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74b2451db00b6b7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 06:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0065f78b0ec9bd18073ef1c2ad2e2f1f SHA-1: 0b43ee96cf5fb61389984960f6f70fa3edb428db SHA-256: f74b2451db00b6b74de7064b6d5a65a564ce950e37994cc6fc144a794a7cb8e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF structure and embedded links suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=mechanics+of+materials+9th+solution PDF link annotation
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/55883205611.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/fulenujidoleto.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zojufolijikipikusibevaze.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tuzit.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109250824555453.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/kizetubiradiwuzixeguju.pdfIn PDF document text
    • http://dominant.name/userfiles/file/rujisemowafivutorigunu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gebomajabifolaved.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/kupekodarevovajugotobos.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/73961080484.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/41283787470.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-21/20210921135157776964.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/zoxaxugiwuguratorexu.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/jusabuwebaruzaba.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3022396960fcaeb08328db704909d7b2/fobobisoj.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wewidididigawa.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/99451948780.pdfIn PDF document text
    • https://ka-base.no/images_content/file/ridafatamofolaniduziz.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/soliterelofisomapunavede.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/milokuzigoxataxu.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jipujinogewogadovizidab.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/14739569236.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/97363233510.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47886271404.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22498386777.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_off0000b575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB575 18236 bytes
SHA-256: 6f356fd7574a488456dd554027d973509a8edda2eb7d0c76b4c4ba0ea241360b
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10864 bytes
SHA-256: e7645ae9c775dfb5627849ee495019489a625a4626dd6ae1aa1a9d0b99c38970

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