Malicious PDF — malware analysis report

Static analysis result for SHA-256 28428f68148cc86b…

MALICIOUS

PDF

73.3 KB Created: 2021-05-06 15:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a04e930d2482303b0f321556ede656ed SHA-1: 17ccb5e9dc5d291f7ee14ab02d60631866d61328 SHA-256: 28428f68148cc86b35f0c5a5e009908c2ddc8a14c028427dd3dc9ed0e41485bd
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'periodic table in excel', which likely serves as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=how+to+do+a+periodic+table+in+excel PDF link annotation
    • http://logawedulukudan.mywebcommunity.org/antiphospholipid_syndrome_articles.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/agricola_family_edition.pdfIn PDF document text
    • http://buybritishcat.com/what_is_the_nature_of_international_business_environment7w6i8.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/89962871913.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/73112714473.pdfIn PDF document text
    • http://blockhcain.host/gegusemz9k72.pdfIn PDF document text
    • http://cheatyou.site/71472480404udw5.pdfIn PDF document text
    • http://nedosako.iblogger.org/retejilevam.pdfIn PDF document text
    • http://geniputan.66ghz.com/capitulo_5b-_6_realidades_2_answers.pdfIn PDF document text
    • http://help-nanny.site/gigabyte_aorus_master_overclocking_guidenmry2.pdfIn PDF document text
    • http://nidupokezol.iblogger.org/taxanelekurerudomagari.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/acls_pretest_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471481/normal_5ff9044a7511e.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/20823582559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6017bac53f6ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawalexigin.epizy.com/les_autodafeurs_2_gratuit.pdfIn PDF document text
    • http://diwigivexuvobe.epizy.com/music_sheet_stand.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/jedakivipilufed.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/definition_of_financial_analysis.pdfIn PDF document text
    • http://luvetux.myartsonline.com/dometic_brisk_air_ii_service_manual.pdfIn PDF document text
    • http://biligisagazo.epizy.com/36040672429.pdfIn PDF document text
    • http://bodiluduf.rf.gd/administrative_management_notes.pdfIn PDF document text
    • http://gajutovowitexij.rf.gd/44990925183.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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 5148 bytes
SHA-256: 3664747d82db75111e904aea10fd1a028a786f3a333ff242bed6a99cd0f2bbde
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10444 bytes
SHA-256: 7e47fe0922dc799f50a37d4a09c23f41bbe6c0125e4faf33e9eb0da1c1e16955

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