Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c334df8199ab87b…

MALICIOUS

PDF

85.1 KB Created: 2021-03-28 05:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 15341f2e9cf6f68958bee819f15b4eda SHA-1: d359c3cebb41f64bca6487222b91f4672dea9e97 SHA-256: 3c334df8199ab87be415a0b699eb9f42ccaf86a313b87e415deada7ba8182b80
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. One of the primary URLs extracted is 'https://midufefew.ru/wix?keyword=power+supply+calculator', which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, appears to contain text related to a 'power supply calculator', serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/wix?keyword=power+supply+calculator PDF link annotation
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/7294226.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/detajanerezigezad.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/4203e.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/dupuzi_turekuxozafufed.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/puvuvururonap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a153971e-d3ab-44da-8b67-71e606b7d0d3/craftsman_shop_vac_hose_reducer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a819b1-4ccb-4e82-8dfe-23592562b1e3/1379295911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b379a3db-e5cc-4f3a-a9fd-38d977a236c8/4093138473.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/94779342973.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_c6f4f517d96c4f648578086acc4804c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/gajipinowososajatanejab.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_3964732bf6a14b6683333853dda841f7.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f987ea22970e47fc8292dc634ff5c4d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/139bbb6a-f97b-4269-94c9-62c222f28046/mandelbulb_3d_voxel_stack_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d66c28-ad2b-4837-a4ae-949b2c018423/how_to_program_uverse_remote_to_hisense_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927cfdae-fd22-41ff-81f8-23f908948ffc/how_to_stop_hot_flushes_at_night.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/jopujad.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_fa0d4f310c904edaa212d5e10fd4ef8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c69c7d0-76ce-4558-bbf1-ddf430cf58b9/shiver_maggie_stiefvater_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/50390734690.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 3076 bytes
SHA-256: f2fb593b84541122937598229266974dddb6c29fef9fc615925f7d6f1cd0ab60
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 5124 bytes
SHA-256: cdac34347ad08a85692c6cf36f33faca8fe317e367e61d0d70c4e9a4f4068676
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 10676 bytes
SHA-256: ff4d60b84196fb3db0a94eba9cdf81da813c400df010979788bc052e8875a106
font_03_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 16248 bytes
SHA-256: e4f386ae05f8b34557d29025ddbe5e26b1028e02e448b84daf4a0b129266c107

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