Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3f8688f3ad87c9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 10:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1672fd25c61a19e61fd282bb0e531875 SHA-1: cb8e8cf0fbdeaa9f1083106ee306e848a261c012 SHA-256: 5e3f8688f3ad87c94b5716a44247b788eea162125dfe0988e5fac2bab52d0502
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/123?utm_term=carpentry+joints+pdf PDF link annotation
    • http://nesebonuvobeju.getenjoyment.net/12555496267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fe5a61bbf51e.pdfIn PDF document text
    • http://boxberry-24.cc/gratuit_convertisseur_vido_en_ligneflxf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_602499903e379.pdfIn PDF document text
    • http://valupimabo.22web.org/42263905566.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/campus_journalism_editorial_writing.pdfIn PDF document text
    • http://italylife.pro/girisakiscecfc.pdfIn PDF document text
    • http://loxigedu.iblogger.org/analysing_english_sentences.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/voguzudap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6029e88c9f366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5fccbf37716b5.pdfIn PDF document text
    • http://gekalam.22web.org/lifufoxewadinavu.pdfIn PDF document text
    • http://nakanilo.club/how_do_i_set_the_time_and_date_on_my_canon_mp11dx_calculator5i0a5.pdfIn PDF document text
    • http://vazukororupob.22web.org/satir_iceberg_model_explained.pdfIn PDF document text
    • http://heliusdesign.ru/411104272834ybry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff3180987431.pdfIn PDF document text
    • http://segwaywheelchair.ru/kawazujinoexaoo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/los_renglones_torcidos_de_dios_sinopsis_libro.pdfIn PDF document text
    • http://leporib.epizy.com/ap_chemistry_atomic_structure_worksheet_answers.pdfIn PDF document text
    • http://rozesefotuduwef.epizy.com/81855162720.pdfIn PDF document text
    • http://zopibekaboxopa.epizy.com/89471291247.pdfIn PDF document text
    • http://fivasire.rf.gd/pevise.pdfIn PDF document text
    • http://muvotezazalad.epizy.com/negative_numbers_worksheet_gcse.pdfIn PDF document text
    • http://tojederetesez.epizy.com/nodewilekugemud.pdfIn PDF document text
    • http://mijekobafenado.rf.gd/kovavix.pdfIn PDF document text
    • http://rikuworubit.myartsonline.com/74188566543.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 5084 bytes
SHA-256: 32353bc173fbc7fdbf4285947f8775779b7e13ed6f5a7b3c7ed25ffcf8747321
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10440 bytes
SHA-256: d83b221946a7b68ea00b55164c991551fb09b629c733c12a9e70037a4b7cf4bc

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