Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c893fb6e05b738…

MALICIOUS

PDF

76.8 KB Created: 2021-03-04 06:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8178fdbe43db0e0697255eb6f8dd772e SHA-1: beb43313583006fa1005a80e8adda5748f308de0 SHA-256: 47c893fb6e05b73800b5b674d01411be1aca83e512761806887ffb4b8cbf40cc
134 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. The presence of an external URI pointing to 'bologen.ru' suggests an attempt to redirect the user to a potentially harmful site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=book+of+pook+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff5b521ed1e8.pdfIn PDF document text
    • http://fomilexavekol.22web.org/lagu_alvi_ananta_terbaru_koplo.pdfIn PDF document text
    • http://rusherx.studio/jumon8gu2p.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/pukavaguren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_600b2abcb9812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_601431e0756b3.pdfIn PDF document text
    • http://flymoney.net/how_do_i_program_my_suddenlink_remote_to_my_samsung_tv85c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601add90e216e.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/how_to_make_a_chinese_lantern_that_flies.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/baritexovopa/google_digital_garage_exam_answers_2019.pdfIn PDF document text
    • http://kepinud.rf.gd/capitalization_and_punctuation_paragraph_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/musokivikorav.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/relative_clauses_exercises_doc_with_answers.pdfIn PDF document text
    • http://vazorilumi.epizy.com/sample_magazine_cover_template.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/spotify_premium_offline_apk_2019.pdfIn PDF document text
    • http://lulanikigog.epizy.com/23871285862.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 4840 bytes
SHA-256: 58cf2cf293fd0b713ec85052016941ea95dce1056af781e87455fb3b52ed43ed
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 11064 bytes
SHA-256: ae4d06789ce694ed0120e3fd720e7df8f16bb603e06ec310c721d5e873527f3c

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