Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb67ef86ac33df5…

MALICIOUS

PDF

91.6 KB Created: 2021-03-22 21:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19ea810aceecb3c80deee94e2fa7938f SHA-1: cfe647b56cb3e49693f205f9eb3f12dbd15c06d8 SHA-256: 4eb67ef86ac33df597ae4df1079ae4a233b72b9ccbe429bd8caffd1fc352a8ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://baarspo.ru/wix?keyword=32.1+the+skeletal+system+worksheet+answers PDF link annotation
    • http://nuxipawuxodiwa.getenjoyment.net/62581379978.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/pimepafawozoxad.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/craftsman_platinum_7.25_190cc_lawn_mower_manual.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/fikezute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_603523795fa60.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/steps_of_accounting_cycle.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/womijuxubotaler.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/fitbit_charge_hr_3_black_screen.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/easy_atomic_structure_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fd7cf0d7b31d.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/ankle_sprain_exercises_spanish.pdfIn PDF document text
    • http:///www.yeeshallknow.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://molodetagako.epizy.com/how_to_cleanse_and_detoxify_your_liver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a07ca9-5438-4744-85fd-48af9cfedf02/pabigebadotoxuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8b3c7d-5d06-4873-9dcd-07034d310860/do_ltd_commodities_offer_credit.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/3939876471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be00861-fdde-4af5-b407-d2be130419b7/9194590111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9416336-fab0-4bac-8380-5575425024ae/kozadimaxikifuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e1b29b-7760-4424-8462-ae8b80483d77/61940545480.pdfIn PDF document text
    • http://nexoradi.epizy.com/bbq_recipes_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 5208 bytes
SHA-256: 59e6a0daa46e1f2d9f5afa7488d66121f11feb1fb0482394838eafc513a44e96
font_01_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 11500 bytes
SHA-256: 86f7ef5b72f7989e4bd7b5842ba44b5f23c14158e61a2e64125bae45e478d9ed
font_02_sfnt_off000152d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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