Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52425cca3e9ec82…

MALICIOUS

PDF

82.2 KB Created: 2021-06-06 03:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8d6795b52c6f5c05137fd991a7998e9 SHA-1: 70d105f9e14aec20e56967775243fa5afb80a66d SHA-256: c52425cca3e9ec825e3b5d822adad707b81f0679351c313f80860820d0cbb2c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://crysiq.ru/pbw?utm_term=will+sony+xperia+xz+premium+get+android+10 PDF link annotation
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/2684751.pdfIn PDF document text
    • https://wadotadu.weebly.com/uploads/1/3/4/6/134633645/pufumejemagimul.pdfIn PDF document text
    • https://zarozeginete.weebly.com/uploads/1/3/4/7/134708045/nokesirokoda-dakitorerederu-tufuxusumij-kuwika.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/mararewibiwu_moxadetiruguno_lelev_dudiwitiwijab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_606dd871c1e17.pdfIn PDF document text
    • https://pijuzuzubafewo.weebly.com/uploads/1/3/2/6/132695302/koluwuwo.pdfIn PDF document text
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/kiwuwezelawenob-lafotun.pdfIn PDF document text
    • https://remenogabeta.weebly.com/uploads/1/3/4/0/134012297/gedijox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_601a1354d8ed8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed330124-59e5-405d-a3fa-eeec584cdb2f/terenikev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539a0938-324e-4f51-a63b-31b483328559/a_visit_from_the_goon_squad_quotes_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad100ff5-0f5b-484f-8940-19ee7f1e2317/taralifikopezefesikafava.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/first_lite_sanctuary_insulated_jacket_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efad85c7-5f05-49e1-802d-a410a3b27cb0/zusowizexasi.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144438432/hercules_full_movie_in_hindi_dubbed_download_480p_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c925369-fa3f-462e-a7d6-a93a52bfbc17/business_communication_chapter_14_quizlet.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/39747493154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7348349-a1b0-448e-9ff4-cde154655528/authors_purpose_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e696072b-8a10-4b62-ab1b-4e6310d761e5/24214835031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbac74a-0e4d-4301-bb91-38aa34f86637/16847493280.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144419820/majusiregutifetipu.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_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 5704 bytes
SHA-256: c3b7b36abf89e0559fd98bed07f6e8c1f726944ce28ff3e07a944d8eaca25537
font_01_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 11580 bytes
SHA-256: 3c2ac44bbe243620cdc73cd23fc3c802ec162c804074a0c576fdf3043261ce4b