Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c7d08f64ec792a…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 02:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e425c06bc986bd91324a9a759d4a7a82 SHA-1: 23b562600fe103475583e41da97726328bda9af1 SHA-256: 19c7d08f64ec792aca2be340182ab9f50f5dcfb067c44bcf6fdaefe83c9a2e90
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external URLs, including suspicious domains like 'vilenefex.ru' and 'xovekofetovo.66ghz.com'. The presence of embedded URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=inference+comic+worksheets PDF link annotation
    • http://xovekofetovo.66ghz.com/senin.pdfIn PDF document text
    • http://xirurup.iblogger.org/android_developer_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd674d5e72db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6056e619341e3.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/what_is_required_for_a_valid_deedji3oh.pdfIn PDF document text
    • http://samoe-samaya.ru/blackburn_trakstand_bike_trainerg30nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fdb9f8110dd6.pdfIn PDF document text
    • http://podipotekoi.ru/turuwuzewitixusomolemh7g42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafepotafeno.epizy.com/mind_map_template_free_printable.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/wimabutisawoxakunarisop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed685aad-5a71-488a-be65-dca8a323b794/5429459819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adc57b6-f572-4377-8d29-ccbaf150675a/what_is_a_synonym_for_touchable.pdfIn PDF document text
    • http://firixafuzive.rf.gd/how_to_pick_sentry_safe_lock_box.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_a8d2a4576e164c10803bdb74c0a77bd4.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_47c183f049834155b50a30fa17533a23.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_cd2dc95806ae4f8da201e3ec48536a0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/739f33f7-996c-49c3-9b98-3f9f1cf8ea65/what_is_italian_for_woe_is_means_in_bible.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_690ca81dbb8d473295d1ccdb36b38b73.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_84d8628533e740eea970e68f06b5d990.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_5c0efb28a257414ba28648f30923360b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8258b5b-a659-447a-9152-f5ec3fbafc3e/16584387992.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 4972 bytes
SHA-256: 55923393d2398b9c1ad2560ec5162cdb26f801c71dfa61c37020517bce840839
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10968 bytes
SHA-256: 4193d8a31c25ae4ed607187a4283ba1e10c6961229c8fce9a42fc7671e323f31

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