Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea6a267d2d543d4…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 14:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4243ff1fb72c6d7cc05744a35f91664 SHA-1: 76990262890020e4786aee55e95ea06ee35e3f26 SHA-256: eea6a267d2d543d4e45d1fb11d74b9ddc822d0cc257ca351239621cb2a323723
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is vilenefex.ru, which is likely used for phishing or to host further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=cualitativo+y+cuantitativo+ejemplos
    • https://migixemigesafo.weebly.com/uploads/1/3/1/3/131381985/702e2da5.pdf
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/8743198.pdf
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/c49785c4e161b3.pdf
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fddcf7ebb0dc.pdf
    • https://gumagujex.weebly.com/uploads/1/3/5/3/135309175/f775f3.pdf
    • http://bezoxafeme.iblogger.org/handout_achilles_tendinitis.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fd1166285124.pdf
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/9386987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_6851158d568047f8b0035013cee49dac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b5391c1-38e1-4edc-af7f-8860a1a943f3/vozijus.pdf
    • http://pamakejexo.epizy.com/91590150518.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_8d0ba8c75b5c4b138a30bd47ccbc0a69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f0190e4-21d6-4f04-a6ba-dae1f66c8f97/how_to_study_geotechnical_engineering.pdf
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_9bb8477d8646405ca5f1723f025bf82e.pdf?index=true
    • http://xexitotikix.rf.gd/jilifowedezapebim.pdf
    • http://gefifeji.rf.gd/runuzagupenimotosorogo.pdf
    • https://s3.amazonaws.com/jazuravazaguz/92111818141.pdf
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_64e52b86d6924d14b25c120ba9b9130f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4decdb03-feab-4898-b9a8-8232f826314f/3253536522.pdf
    • https://s3.amazonaws.com/makumapikeze/explain_the_7_ps_of_service_marketing.pdf
    • https://uploads.strikinglycdn.com/files/33027a59-cb9a-4314-941f-b1ab8e5158b1/does_agno3_and_hcl_form_a_precipitate.pdf
    • http://refowokewip.rf.gd/integer_operations_worksheet.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_off0000f57b.bin
5da2fde4247eeefd038701b96e79a2a30946f37f7e1514636f0c2acb4958acb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5128 bytes
font_01_sfnt_off000106ec.bin
90628cebe22f72791cc5ff2ed7653322cd9be767f9f8a66ba8c7bbb564c3b866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 11408 bytes

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