Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d684528e75645b4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 13:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81db85962efc9716b791d5d3d79dd422 SHA-1: 7c1937214ed6a88215bccda81976a9e2dbae9a2d SHA-256: 2d684528e75645b4c94922b70276ff652d88655e37fe3a570d22e62c52a2085e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to distribute malicious content or phish users. The embedded URLs are likely used to redirect victims to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://vilenefex.ru/wix?keyword=hangover+teri+yaadon+ka+lyrics+in+hindi
    • http://zexezolevonim.iblogger.org/bandung_conference.pdf
    • http://microdigitalmeter.xyz/how_to_use_resistance_bands_for_rotator_cuff_exercisest6q78.pdf
    • http://sikalaporaka.22web.org/como_calcular_rumbo_y_azimut_topografia.pdf
    • http://letxxnx.org/bonivoxivekunaspcdb.pdf
    • http://nikecortez.net/how_to_store_blender_bottlesm5fqo.pdf
    • http://moxegelubopidi.sportsontheweb.net/48056387967.pdf
    • http://devigebogubiret.getenjoyment.net/22835374225.pdf
    • http://rovepofaji.22web.org/48987513640.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_5133615daaef4cb0b0b3606e414f1e3f.pdf?index=true
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_c8b7c98482ba46a694dd67f8d60f4e3e.pdf?index=true
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_a6f61b8c19364048a083a859e1b1fc2a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ff95bcb-acd8-4fb5-8746-b93cf1017116/how_to_write_a_conclusion_for_argument_essay.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9e46c13812104e828eba076321c1bee8.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_57ad6d10526b470981a3010fba85afde.pdf?index=true
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_4c6cbfd8741047e79ed4342ea8a11407.pdf?index=true
    • http://daximogosamov.myartsonline.com/artocarpus_lakoocha.pdf
    • http://jufebiwewizeza.rf.gd/8770072241.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_fbb6c0c4fcdf465ca3d4139cbdade4fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d966aead-db38-43d0-92b0-07e7fde490d2/48110846276.pdf
    • http://xasejumav.onlinewebshop.net/blockchain_developer_tutorial.pdf
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_e7c60d0c52004ea9a623453a253c052c.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_78cf2caf202e4069b43b7a38bd6525be.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_2571359c565a445bbc357e9a48a3d2fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40b7df50-ef4b-400d-8231-c481993ad6e1/thinkorswim_tutorial_2019.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcc.bin
038b8993ea523b9db900121bce6f1cefdfd072085eaee24d3b725439e4f7ac13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 5388 bytes
font_01_sfnt_off0000fe28.bin
4b7922277cc7096d1e9f590b172360c653ea55f5da2f90dd5d3d463b355eb613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 11124 bytes

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