Malicious PDF — malware analysis report

Static analysis result for SHA-256 5824bcf7e84fcb8c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 21:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f3a88940025394ad6ca6f3b7181143ad SHA-1: c63341a3c78ef7fe66f275441d36f9af26efcd64 SHA-256: 5824bcf7e84fcb8c122b663b721b2e2513e1b3f4b244b5f5cc24ae784075ee36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links hosted on disposable domains, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, contains text related to 'correspondence templates definition' and the wkhtmltopdf application, which is often used to generate PDFs from web content, potentially masking a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=correspondence+templates+definition PDF link annotation
    • http://pazefezos.mywebcommunity.org/76439202530.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/devufabedanitanunoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5ff7f8c0e6f62.pdfIn PDF document text
    • http://jozarizotugi.22web.org/manual_de_usuario_h2o_mop_x5_en_espaol.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/14557655005.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/everlasting_god_piano_chords_william_murphy.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/why_did_mary_shelley_write_frankenstein.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_60107e97f31dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fdc6c79c725f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fe5d5f91b2e8.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/pdf_split_and_merge_basic_ver_2._2._4_download.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/par_quoi_remplacer_beurre_tartine.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/carte_touristique_bretagne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugoxasozuvazet.rf.gd/does_oxidation_occur_only_at_the_anode.pdfIn PDF document text
    • http://dimakadube.epizy.com/14575000367.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/electrical_engineering_jobs_melbourne_fl.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/blood_pressure_normal_range.pdfIn PDF document text
    • http://wenares.myartsonline.com/82532961854.pdfIn PDF document text
    • http://bezegorev.epizy.com/79519858907.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/sidetuxesodanufobipulomas.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/zosetudopudogoxa.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/dollhouse_2020_movie_review.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/modelo_canvas_editable.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/gudotimejo.pdfIn PDF document text
    • http://tudugir.atwebpages.com/832158747.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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5208 bytes
SHA-256: f1f1ba441c491cb0f8b5fdd9ad1085c8e3cdd409b19cad6e65968543ad289228
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10800 bytes
SHA-256: 746db7722531edced814dd8b1a5e8daaf744c812f47b0ce7d145e292f271b151

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