Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf24e6d84228724…

MALICIOUS

PDF

81.6 KB Created: 2021-03-14 13:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c08510ba332e7fefb4bf4e0cfc130794 SHA-1: d138bfdb8c8a8ee9d66b865aac4ed377c9b862c1 SHA-256: fcf24e6d84228724aef4d1db5cbc4e68b3bffcc37f9df24b757c8579651b2dc5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to benign-looking PDF files, but one prominent URL, 'https://jottigo.ru/123?utm_term=amita+ka+sita+song++dj', is associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm or distribute malicious content. The ClamAV detection and ML classifier strongly indicate a malicious PDF, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=amita+ka+sita+song++dj
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/mukekikuneburaw_vajopijajateguj_zikosiwi_jozivupofa.pdf
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/8375549.pdf
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/9764523.pdf
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/240b717e258f9a.pdf
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/060d9520a.pdf
    • http://wigoduxaru.22web.org/basic_computer_knowledge_notes.pdf
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/1815313.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/xamifoninefi_lasuwidimekow_jaditumo.pdf
    • http://kutejovanog.getenjoyment.net/53897757614.pdf
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/8d6dec0f1933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_fdbad9c3e02a4535aa96749f34e43a3f.pdf?index=true
    • http://pabisuf.epizy.com/indoor_air_pollution_control.pdf
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_bb82ac338cb64d1ca7a4a9efdc3aecc9.pdf?index=true
    • http://rolexewosuvasu.epizy.com/30632246956.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_e3b735bb0def4b1cbc3c3152a560cc3e.pdf?index=true
    • http://ripotuteruposa.rf.gd/55392387915.pdf
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_1a276863c49640afb6c091676e62a5d4.pdf?index=true
    • http://rufofexejojar.epizy.com/cid_officer_form_2019.pdf
    • https://e4cb95aa-ee47-4bec-abab-95a5b702e025.filesusr.com/ugd/4c76bf_5bad441cbf2345269ab2d866b6d5bfb3.pdf?index=true
    • http://mawidinivetobi.myartsonline.com/kewowipivitefukudafedifa.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_62c59d43c0a649c3a963b30b8b3e4f72.pdf?index=true
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_655e9c95447e44388fdee4851d519738.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23e.bin
02ee22216031e6d16f124477864cd679818f575ee2478dcd44d9537d8c09712f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5144 bytes
font_01_sfnt_off0000f3b1.bin
f79cb581af50388d73dfab9f7656fa1c24ab3494721cb30bfb16ffaba69dbbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 2392 bytes
font_02_sfnt_off0000feab.bin
6e88b9d2ba5113a0376072da3f41a9ea528d1066a2dca234ebbb681fc71819c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10484 bytes
font_03_sfnt_off00012252.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16060 bytes

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