Malicious PDF — malware analysis report

Static analysis result for SHA-256 efae94fbf13a0ee8…

MALICIOUS

PDF

87.9 KB Created: 2021-05-21 13:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 158af1108f3301f6992dd4e2d6337f71 SHA-1: 6638f93f4acf2bdc5476e5c0cc4742726fc464f6 SHA-256: efae94fbf13a0ee8bfc4e2f1b2ab6360a7322a9e6723842cb107727fe9b37091
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://vilenefex.ru/strik?utm_term=swords+and+sandals+5+mod+apk', indicates a lure for a modified application. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=swords+and+sandals+5+mod+apk PDF link annotation
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/043fa8aa8a94a4.pdfIn PDF document text
    • https://jugikezifu.weebly.com/uploads/1/3/4/6/134654678/vipevozi.pdfIn PDF document text
    • https://tumuzisokume.weebly.com/uploads/1/3/5/3/135351536/didilezujoxopuj.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/bawenedamo_mikomesad_faxakudar_lipiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fdbb4349a16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_60468b8fd03ea.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/3895598.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/vapatetimuzerev.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/zufofejisu_nadabapowatobi.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/tuwavozibizunu_jabulaxajovipo_tiliwupekajoxo.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/425429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/56995974751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37241831-38ae-4237-b862-aea416aedb93/netuwanipibepezawegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c4fad9-17cf-4747-b1e3-7e5d0be8da90/92678744503.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/doforavefaxekopide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1f6d8b-98d9-45e3-9e10-b669ec32d9f0/xabenemunuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebf33c7-6b58-45dd-b70e-86744ec673ae/40915923414.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/pudobej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60aa624c-aa13-4dd7-b580-00343678497f/girl_scout_junior_pet_badge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119199c8-3158-4b29-af7c-113a2c7076a2/gafapigifaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1315e33-a3dc-4f63-8980-1e6399397877/76839666727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e02ede7-5b8c-4248-84f6-5219ad936389/who_moved_my_cheese_movie_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 5488 bytes
SHA-256: 3d0122b397cfa87cddff61c0815cd16f3c8e12f8c0e7aeb13776085e80778c02
font_01_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 13260 bytes
SHA-256: a49bc90e582b4cd43678465e566dac60c5472445d1d9a1120368183b6e121e8e
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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