Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acbc97692dd6c86…

MALICIOUS

PDF

73.3 KB Created: 2021-02-22 03:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8309b5c19601db862463d25adadd8dc SHA-1: 52492acb8e67162889f205a49cea980165244fe9 SHA-256: 9acbc97692dd6c86bec551cad388a0ef9553647fb3916fa2ad444b30bee56e47
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wb?keyword=after%20virtue%20macintyre PDF link annotation
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/gijunixeloritem.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/jonefopifix-sozivajazunov-litedunewabunog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fdfc27e77076.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/gujukuka_jozawodiniz_nemovujujuza.pdfIn PDF document text
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/ruwefiledumujimo.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/jomoxadane_zukuto.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/7731452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6031cc82aee8a.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/dovoxenevadasuv_gifosizatuxi_kadugemikebo_rarezigakiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_6005b1be5b23e.pdfIn PDF document text
    • http://femukujisidape.iblogger.org/67585764514.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/0a193d19d438ee.pdfIn PDF document text
    • http://matorebaxemipiv.22web.org/modelos_de_comunicaciones_internas_en_la_empresa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufuravolej.rf.gd/whatsapp_for_windows_8._1_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/bolero_car_video.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/42006348012.pdfIn PDF document text
    • http://kusotuwomaru.epizy.com/background_app_apk.pdfIn PDF document text
    • http://lufukasiwi.epizy.com/15532358120.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/bepapovekisidudoz.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/cheat_sheet_html5.pdfIn PDF document text
    • http://pivirujifija.epizy.com/fawomilu.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/java_jdk_32_bit.pdfIn PDF document text
    • http://fefolitaweni.epizy.com/android_lookup_wifi_password.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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 4968 bytes
SHA-256: 6324e7608ef34657054f0cc9ed50299b53168f8bbe5bbe23f0a9b9124f6978ff
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10804 bytes
SHA-256: 1095025665f0776c8a4f44d9a780161710664c9f5f8fc0b81ce170e5abed92d2

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