Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f6552f1e860edc…

MALICIOUS

PDF

74.0 KB Created: 2021-05-11 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 004c1152b5e382a287030732847c202b SHA-1: 22d5ba7ebff5b7aed0dc465a798a87044fc983b7 SHA-256: 84f6552f1e860edcf0ad75ba407239f312f291707ad28f931328cc24fd6c4584
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with a primary external URI pointing to 'https://dugedepap.ru/strik'. The document body, though heavily obfuscated, suggests a lure related to 'fasting and praying', likely a pretext for phishing or a scam. No scripts were extracted, but the presence of external URIs and the phishing-related heuristics strongly indicate malicious intent.

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://dugedepap.ru/strik?utm_term=what+to+avoid+when+fasting+and+praying PDF link annotation
    • https://cdn.sqhk.co/gabebutiz/dmBigib/xogogefuboboraforofemeraf.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/f0herjc/hku_early_admission_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/f7hgHdH/snake_worm_zone_big_worm_io_2020_mod.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/1404439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_601e2d4f207f3.pdfIn PDF document text
    • https://cdn.sqhk.co/sufarosorov/eidvgcG/arcade_machine_repair_guide.pdfIn PDF document text
    • https://zisojemikema.weebly.com/uploads/1/3/1/4/131483184/sidekanowas-sizon.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/ruxobafut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5fcaf2f845325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_60397db6e5c21.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/how_to_repair_water_dispenser_leak.pdfIn PDF document text
    • http://manaluw.iblogger.org/base64_to_java_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojugejuxutusur.epizy.com/17028116808.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/teamviewer_10_free_for_android_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/agbalumo_mi_by_seriki.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/billie_eilish_photos.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/livro_avivamento.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/love_yourself_answer_bts_pre_order.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5536 bytes
SHA-256: 07b2339c8816c0396c2f59967628d26bce451611aa9afd9f124186098efa2fd7
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10344 bytes
SHA-256: b1ba61ebf87363a678c88ed8c031a5a8f8b1ae0c4d23d1511b8ada45dcc32323

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