Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebb6c25ba5e7b96…

MALICIOUS

PDF

85.7 KB Created: 2021-03-18 01:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 932a1ede0657c81152d96e06ff0d0215 SHA-1: 1ad623962c3c7ab6f78a16eab64817c9f7cf7ebc SHA-256: 7ebb6c25ba5e7b9650b5f6feda043b52dc0291b1c728a401779311cd34604c50
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=pink+ruger+sr22+accessories PDF link annotation
    • https://wemadaxofopu.weebly.com/uploads/1/3/4/7/134752229/vizajiwu_dekaliv_zujete_gutudevalobi.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/7460732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_60173fcc4036f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_60226a9886650.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/4464434.pdfIn PDF document text
    • http://detobusukited.iblogger.org/simple_audiobook_player_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_60128f26c9ecd.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/6902272.pdfIn PDF document text
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/8582262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_60117a59112a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_604d21bd1ceb7.pdfIn PDF document text
    • http://rumudasejozekes.iblogger.org/physical_carcinogenesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_26622de64f61405fac926b6c4319f63f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/12089545471.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_f27cb6af40c84da8b4f6e20764174daf.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_8bdf36234c7e4943b9641d6514f90902.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/notice_of_findings_and_recommendations_template.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_bb6d7bfe6113422fb4ab4e2fc626a7b7.pdf?index=trueIn PDF document text
    • http://bosotosevizava.rf.gd/30913815106.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_9277d21cf25946578d9339db52a39b1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/chiswick_high_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/bhartiya_railway_bharti_form.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_e2fa543a043e4d41bdeda5f67825a90f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/generic_bill_of_lading_form.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_256b1000b8e44ff6b7e09555d52e7c1f.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_ea1b57b710e14b6fa8842214fa568552.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 5132 bytes
SHA-256: 90641f41fb7d2a0cd3a8dc06de38e39f4576116ce7725108e26f88dab8402b68
font_01_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 11776 bytes
SHA-256: 117af5ffb263997f06b6c299182d2bfd07530108b72f2a5cbfa28dfc8619ec5f