Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d24e84fef98fdc…

MALICIOUS

PDF

83.1 KB Created: 2021-03-14 03:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91e707484413eeed6ea8ba9c0ac8db6 SHA-1: e58b641bb3dcc6687bdc4070fa2a60380344e8cc SHA-256: 91d24e84fef98fdc19d7b1c396dd6284aa0e5665e533e9cdd24f9bb84c98de70
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm designed to distribute malicious content or engage in phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external resources. No scripts were extracted, but the PDF structure itself is used to host and link to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=apgenco+notification+2020+pdf
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/7503482.pdf
    • https://cdn-cms.f-static.net/uploads/4408594/normal_603724b038092.pdf
    • https://static.s123-cdn-static.com/uploads/4446287/normal_5fcb8ea64a704.pdf
    • https://cdn-cms.f-static.net/uploads/4450519/normal_601a0079e34d7.pdf
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/vobavabadovow_pirawu_popajolevew.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_601af9dcd22cd.pdf
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/6394272.pdf
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff259f92f329.pdf
    • http://jirobanu.22web.org/basic_components_of_computer_hardware.pdf
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ff3882c915bb.pdf
    • http://puxelamonikur.22web.org/welch_allyn_connex_spot_vital_signs_service_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5ff9181d1e714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_8fe88faafd594efea9b9c5e566c08cd6.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_0cdf4339404b48a58bd4a2f53c3c6557.pdf?index=true
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_2506c367525e487ba58497737fb38f9a.pdf?index=true
    • http://roniwixanedif.epizy.com/wogepowukuk.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_f8dcd2ca6dbf4ef18d3d392550eafc50.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_1088a630b6564798889b572031b6912d.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_c40e9bf3eaad4c5393777ba48685f4d0.pdf?index=true
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_3dc25d0b05cc41ec8dd38df42f603ceb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05d.bin
1b3be26dca3882ae5469d8deaa35fcde448fb7adb9bfd00394da7d83c458972a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5280 bytes
font_01_sfnt_off00010277.bin
381a2ccf353754957681ea5ca50d6a7e387896db9ddf000267fb1ba541904e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 11584 bytes
font_02_sfnt_off00012a1f.bin
292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 16096 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.