Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68cb0782036a7e9…

MALICIOUS

PDF

80.5 KB Created: 2021-04-04 19:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e471acea12560204a9363dad3385bcd SHA-1: a319682023e70d58d9a0c728f4f9631ca13d290f SHA-256: e68cb0782036a7e990b3483879f97b00733648e3c3e9e3c53054564c88fb0f22
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=samsung+dmt800rhs+le+error+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384480/normal_605f2e1bdc863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601bcbd9a1b61.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/5017394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005c0d4ba3bd.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/cccc4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_601d5fe49f6f5.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/nezotapawu.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/4eacd66b-1d7b-467e-a510-05a3a78d928b/draw_a_person_test_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23860401-d21a-40d6-8ec0-3a77084ae29a/college_biology_lab_report_example.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_9791c5fd39bd4cf989845bd24124c1b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/117ddd10-5e77-4f7d-8506-1a6de28fe83c/matlab_for_loop_array.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_06862b6238464ba8975eb34976c6ee43.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_84ca2e65f12442a7998dd573046ffe6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2d55df-1f2c-4c58-a16e-fabfd62825a7/12140191113.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_9d06fdf0d1254d8bba327f2c176f83e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b775fbf3-8be6-4756-bd65-0a7184d3e5bd/83635045770.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_f65b80258f524dffa7e0757562ea0c17.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_450696e919b640a799748d27046d78ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28af5c3b-b4c1-4667-9e9a-ad7185f99c8b/wendys_single_cheeseburger_nutrition_facts.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 5792 bytes
SHA-256: 150a7d81a86c1aa2df45ceeaea12f6ca1d4fc959c7b6ed8bdacd83c1fd8d2c82
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 10764 bytes
SHA-256: 04c2a4238e2aeac4d2de190c44105a9bafbbf505399d7fe8748be449644f690b

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