Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bf703b8824ed6f…

MALICIOUS

PDF

72.3 KB Created: 2021-04-13 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b2677376cbf3518a595b33667022bddd SHA-1: 73da108c44fe26554c94948789c4869c5ac1b895 SHA-256: 55bf703b8824ed6f28910af8a67ac4ac894443b885184999558d499125e04286
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'drawings with horizontal, vertical, and inclined lines', likely a pretext to direct the user to the primary malicious URL. The presence of external URIs and a link farm heuristic indicates an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=dibujos+con+lineas+horizontales+verticales+e+inclinadas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409110/normal_601d8dc278113.pdfIn PDF document text
    • http://newidowakev.22web.org/how_do_i_reset_my_samsung_s4_mini_to_factory_settings.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/jifezijibagikepejugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6000c861ecaef.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/1926848.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/1713507.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/osrs_aberrant_spectre_range_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff0d9fccce0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601d210460549.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/233c9.pdfIn PDF document text
    • http://peramen.22web.org/internal_audit_closing_meeting_agenda_template.pdfIn PDF document text
    • https://nozubewow.weebly.com/uploads/1/3/1/1/131164313/1639225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumebesatupa.epizy.com/que_es_enfermedad_anemia_falciforme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c084bcd-3567-491d-a1a7-23e635d24418/joborozijaxogujan.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_734fb69af7c3416aac1ed6649e721dbe.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_5aedc727e3824f7291551bbaf3b065f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/google_sheet_template_gallery.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/crown_of_midnight_page_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6314b6e-574f-445d-b926-24b5aff48944/how_to_describe_the_moon_and_stars_bangle.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/95574330278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7deb3d4e-73bc-4ea9-9614-8c36b7ae4ecd/virginia_woolf_the_death_of_the_moth_essay.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 5352 bytes
SHA-256: 1eca65ab0f19e2c8aaba89f62d8e308314f473daae00a19c52116b2877cdf6c5
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 11104 bytes
SHA-256: eddf2f655427295e8984428e48f15a01dffb840e58fd9f986b841732ec51bd37

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