Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69f4904ab611f8e…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 23:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 48c5f2087fdc073b25e6f4992a5950a0 SHA-1: 284c7c34ee1ac185d4c538c0e4209a7eaf298c47 SHA-256: b69f4904ab611f8e9e39527d9d414289800a2ec45f435ea78be2c0d056c4d929
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://jacksth.ru/award?keyword=baixar+impressora+pdf+24+gratis', suggests a lure for downloading a PDF printer, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jacksth.ru/award?keyword=baixar+impressora+pdf+24+gratis PDF link annotation
    • http://tixshopclub.fun/80621314699skj1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_603cb8150c5ae.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/48638739138.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/zufanabuvodebivebisolaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_604e7504b2100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_6036030ca7ffb.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/xewoxakikanorojo.pdfIn PDF document text
    • http://static-start.top/mapa_conceptual_sobre_niveles_de_lecturauu81s.pdfIn PDF document text
    • http://blacklaser.ru/kanilemibowedeeoms7.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/explain_ebcdic_code_with_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5febd7ce47068.pdfIn PDF document text
    • http://accueilcmb.com/74361391561zxu8a.pdfIn PDF document text
    • http://megalivadixen.iblogger.org/42382210802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepulufe.epizy.com/what_do_you_call_your_godmother.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/isometric_graph_paper_a3.pdfIn PDF document text
    • http://bitiwumit.rf.gd/donafovepodekefawej.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/list_the_7_characteristics_of_all_living_things.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/simixuvibaza.pdfIn PDF document text
    • http://nagomekivi.epizy.com/modular_origami_star_tutorial.pdfIn PDF document text
    • http://rebivik.epizy.com/momomapidisoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/al_fajr_azan_clock_cw05_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/living_buddha_living_christ_by_thich_nhat_hanh.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/bareilly_college_private_form_2018_date.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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 5664 bytes
SHA-256: e8bd2e79ce9ac63cfec4423d63338b7a411207e0b4885b83dd6f2005bef7dbf7
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 12500 bytes
SHA-256: 02e3ebb4bbddd94120f0f8a20c2d7a022ee510b150644b0ec1ed8cd70a567dcc

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