Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6f1e388ac5d2e…

MALICIOUS

PDF

108.0 KB Created: 2021-05-07 18:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a8d224c31d02feda30cca8f7bc8a2305 SHA-1: 24816532b3dc4a3f6d175894f01aae31abfd7097 SHA-256: 93c6f1e388ac5d2e18e211c9afa73f6227372e2575a84e06f01098fcd56a7df6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to '2005 honda accord maint reqd light reset', suggesting a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://seumenha.ru/strik?utm_term=2005+honda+accord+maint+reqd+light+reset PDF link annotation
    • http://vukojekan.mypressonline.com/arquitectura_bioclimatica_extrema.pdfIn PDF document text
    • http://jujasoje.iblogger.org/68252470588.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/legid.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/1782679.pdfIn PDF document text
    • http://mamuzomilap.iblogger.org/lukudegawudalewetejoran.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/academic_integrity_definition.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/dabon.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/vasolof.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/d18eb8e.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/toxonuradowo.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/zifozujiwi/kejegepusidukutuja.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/zigujenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/sketchup_program_za_crtanje_free_download.pdfIn PDF document text
    • http://wenares.myartsonline.com/how_to_become_a_marketing_manager_without_a_degree.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/how_do_i_connect_my_fintie_keyboard.pdfIn PDF document text
    • http://wuvuwipiwizovid.epizy.com/97983937966.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/bsc_books_for_free_in_mathematics.pdfIn PDF document text
    • http://savunibuguk.rf.gd/98072669622.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/92618181003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2f021b-38e5-4804-8115-71180973f99e/singer_sewing_machine_model_457_review.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/72522782544.pdfIn PDF document text
    • http://zonadomafi.rf.gd/jajarekexawafozuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5be6962-eeb8-4b9c-a56d-6925f4c48169/photoshop_tutorials_free_download_in_tamil.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_off00016616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16616 5784 bytes
SHA-256: 3557291158a3750fcd4580a59ec234b85d9d255731e69a4841adde57a4f60032
font_01_sfnt_off00017991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17991 11936 bytes
SHA-256: 8376f6c14ecc06c7b5a2997ae2a93275672cfc1d0d0c23239ba602c3a73db72c

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