Malicious PDF — malware analysis report

Static analysis result for SHA-256 4430b3d35181b58c…

MALICIOUS

PDF

74.9 KB Created: 2021-05-16 02:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6e5a545f60cf41a4929e8d992032621a SHA-1: 27d982e77d7667cdc009e52e0ef4129d384c02f6 SHA-256: 4430b3d35181b58c963e74a96b65a016923ef6123ed88d17084dc5d17c09fe4f
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The primary URL, 'https://druttle.ru/strik?utm_term=what+does+aisi+stand+for+in+steel', appears to be a phishing lure. ML classification and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://druttle.ru/strik?utm_term=what+does+aisi+stand+for+in+steel PDF link annotation
    • https://zirejuvisipaz.weebly.com/uploads/1/3/1/6/131636922/gulupaginewusebis.pdfIn PDF document text
    • https://gopaxeseje.weebly.com/uploads/1/3/6/0/136082610/bb26bf5e7.pdfIn PDF document text
    • http://nuzenurego.22web.org/ambient_voice_recording_android_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_602ee9c790d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fe817fa5118a.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/bonixefazusemubinaxi.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/kudufigunabi/is_this_book_age_appropriate.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_45b65b5bc9884f0c9d3af11f99cd2931.pdf?index=trueIn PDF document text
    • http://xuwomotibinifen.rf.gd/76535576522.pdfIn PDF document text
    • http://topotiras.rf.gd/15662559661.pdfIn PDF document text
    • http://sumidemeg.epizy.com/96142063662.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/facebook_android_file_location.pdfIn PDF document text
    • http://vewizoxevig.rf.gd/45564436078.pdfIn PDF document text
    • http://nefizobutimuzi.rf.gd/96033142844.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/80146522654.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_36661fb6786a4f619556816fc353575a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/how_to_draw_a_circular_flow_diagram_in_word.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_fa9872597f534a9ea2c80e75f5ec6c92.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_5c4db8c383ec400c8cbf66cf49160c94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/organic_chemistry_exercises_and_solutions.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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 5008 bytes
SHA-256: 0132259f06b03a9acc69d8b2cce25a9e4c72d43a7a2366a6618569fa4503997b
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 10976 bytes
SHA-256: 610e664ad13b6ecdc1d14a8a243287d6447f0382210d06b78b73166015cbc8c4

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