Malicious PDF — malware analysis report

Static analysis result for SHA-256 063cce83dcad4a6b…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 05:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58f82c06eb13d680bce15eb5c7981428 SHA-1: 75df9e7bd211cedeed1c40fa65885c0b94322c95 SHA-256: 063cce83dcad4a6b7df0334d23887cc4e4d3e4eca97e8ca8c33a2b4689d1c484
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://nipisod.ru/wix?keyword=digraph+worksheets+kindergarten+free', which is suspicious. While the document body is heavily obfuscated and unreadable, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=digraph+worksheets+kindergarten+free
    • https://cdn.sqhk.co/solijisivono/gdO0Zjh/91779236358.pdf
    • https://gigodetexopisi.weebly.com/uploads/1/3/4/6/134630538/614e1228ed10c.pdf
    • https://cdn.sqhk.co/zoxowowi/wiarjgQ/65762871190.pdf
    • https://cdn.sqhk.co/fowifabibu/fLfNjg9/sodaxewotedokefor.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6015ada4c8ce7.pdf
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/610a7df33.pdf
    • https://cdn.sqhk.co/jidelugob/igjhahh/mobile_kitchen_for_sale_in_cape_town.pdf
    • https://cdn.sqhk.co/nugopanage/dE1H5M1/game_show_voice_over.pdf
    • https://cdn-cms.f-static.net/uploads/4417995/normal_601491b9e7b3b.pdf
    • https://cdn.sqhk.co/sekeniti/JkhaUnE/authorised_push_payment_fraud_compensation.pdf
    • https://static.s123-cdn-static.com/uploads/4401515/normal_5ff46c80c0da8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kulinisokakewi/how_to_make_marksheet_in_excel_sheet.pdf
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_85ae8b97e171409fb8c68644fec0e94e.pdf?index=true
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_0c75a08b0ee549c591d6c22855388c29.pdf?index=true
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_6d80db0224e74b6da6e25a1419502c6d.pdf?index=true
    • https://s3.amazonaws.com/filidabut/72649468441.pdf
    • https://s3.amazonaws.com/mikibetiv/verbos_en_ingls_conjugados_en_presente_pasado_y_futuro.pdf
    • https://s3.amazonaws.com/mogipegi/kovukikokarofisoruv.pdf
    • https://s3.amazonaws.com/jukoxisojow/the_natural_rate_of_unemployment_is_quizlet_macroeconomics.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_off0000f728.bin
053d1a56b5359645ae523c526757559b7da632ccea1f575e5c1f5fa413775790		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 5428 bytes
font_01_sfnt_off000109b2.bin
9449f9a33f75e23644f551dfeecddee7dc524c1c5bf7291502844c2191a23509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10932 bytes

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