Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4142f572f685011…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 03:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 594602e27f21e26530d2eefa1102d2c5 SHA-1: 17554d4846ef13da90b13636c302825add5f4c99 SHA-256: a4142f572f6850116d9b735e2c28e85e97a3eb882d5e36bcd1ca04fa6f646f15
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm hosted on disposable domains. The PDF document contains numerous external URIs, suggesting it is intended to redirect users to potentially malicious websites. No scripts were extracted from this sample.

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/wix?keyword=siete+maravillas+del+mundo+antiguo+y+moderno PDF link annotation
    • https://vuguzazevuzuk.weebly.com/uploads/1/3/5/3/135316601/391acc.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/cbse_syllabus_for_class_10_maths_2020_19.pdfIn PDF document text
    • http://euroshopme.site/libro_sociologia_de_la_educacion_ana_maria_brigidoh773r.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/9185445715.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/how_do_i_connect_my_plantronics_cs540_to_my_laptopk7qwi.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/62519777043.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/5ffcedb25.pdfIn PDF document text
    • http://probkin34.xyz/huawei_cheapest_android_phone_in_pakistanyl6eq.pdfIn PDF document text
    • http://1offpark.xyz/pazobadug86s8e.pdfIn PDF document text
    • http://creditreportusa.info/18035355931hia21.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/losoru.pdfIn PDF document text
    • http://minuette.me/forming_and_solving_equations_worksheetmcpeu.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/ansiedad_psiquiatria.pdfIn PDF document text
    • http://pollsexpert.com/dewoborududanizyz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_b76d6b8c35fb45579f9ad1b5aa65502a.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_6d4cd0db86f7468992b527158a8a6d3e.pdf?index=trueIn PDF document text
    • http://mulirogikek.epizy.com/binondo_food_wok_map.pdfIn PDF document text
    • http://gujusama.rf.gd/guntersville_fishing_report_september_2018.pdfIn PDF document text
    • http://loxupobupibim.atwebpages.com/82197203411.pdfIn PDF document text
    • http://jawuguv.epizy.com/my_troy_bilt_blower_wont_start.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_261e4ddc988a4d63b6d01026e412c7b6.pdf?index=trueIn 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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5408 bytes
SHA-256: 9095cc17a7d64c3e32c892386b58768750eb174cad4ae02e737aa250cc21c765
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 12180 bytes
SHA-256: da9cba051db1812fa0a04ad11355426afad3b63e6d71d654840cfa8af7f8da5f

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