Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12adbf87383a700…

MALICIOUS

PDF

89.2 KB Created: 2021-03-19 04:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 607c780758ba5b4c3d017da7764c106f SHA-1: e1a789389528e006e16183c6b29190a76d613625 SHA-256: d12adbf87383a7009cab25a4c63d86948d4e11651f1825c9b43d9085d2e04c07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=rational+numbers+definition+with+example+pdf PDF link annotation
    • https://cdn.sqhk.co/dimusokobab/cHjhGcw/84173122166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_6050b9ef39a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_600aafb590dc7.pdfIn PDF document text
    • http://trynutra.shop/what_does_the_area_under_a_velocity_time_graph_tell_you8njaz.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hhFgcs7/61520909143.pdfIn PDF document text
    • http://marinarus.space/410471101583k6oy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_604a8166755d3.pdfIn PDF document text
    • http://nicepics.xyz/1989_suzuki_sidekick_suspension_lift_kitl6gea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fd317e125cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_604e914f80cbd.pdfIn PDF document text
    • http://fixmarker.fun/jedudgzt33.pdfIn PDF document text
    • http://kino-vezde.ru/is_a_phd_worth_it_reddit_scienceqjdix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jadudusujuje/kujatuvizo.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_755686d0d7af4eb7a168bd626f57edcb.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_e6b473b813514c93b183b0d84e47b0a8.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_bdad226eb4eb4ea7bf0fa326de004c62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/minecraft_how_many_bookshelves_for_max_enchanting.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_dd895846143744d0b3caf537d0619978.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_f19c854023c84e519912d21de3033520.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_4bda45a06d1940ab81166b3884ce2f4a.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 6520 bytes
SHA-256: 121f0cd6ce4622a04ce065635acc9c2ec3aa9322fa3b9b6755cc8851d38e1192
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5468 bytes
SHA-256: 773f08e649aa144c5316b51f540b29b9f43b46e60cb77128837948dc0cf21a72
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 11912 bytes
SHA-256: e7b30a6d1d108226697d24487028a1409d761c08f1f8c2382a77bf24f1907c80
font_03_sfnt_off00012eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 16780 bytes
SHA-256: b295d336ab2db2fb1c11233b28116d197a4708ea254dd94f78a9db4373cf980f
font_04_sfnt_off00014662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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