Malicious PDF — malware analysis report

Static analysis result for SHA-256 8991fa9439b6673c…

MALICIOUS

PDF

84.0 KB Created: 2021-04-29 21:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46c511f934803eab3982b2b4f43bf0a SHA-1: b32d03471b4017ea808cd4cfe28ddf3e325e9186 SHA-256: 8991fa9439b6673c4774dd8b0731af2da2cc976328b798ad42e5379ecdbf7fd4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links points to 'https://ponafet.ru/strik?utm_term=what+intermolecular+force+is+found+in+a+water+%2528h2o%2529+molecule', suggesting a potential phishing or malicious content delivery attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://ponafet.ru/strik?utm_term=what+intermolecular+force+is+found+in+a+water+%2528h2o%2529+molecule
    • http://sunufosabupes.scienceontheweb.net/88701163987.pdf
    • https://cdn.sqhk.co/tunuviju/Kighhh8/kpop_boy_groups_ranking_2020.pdf
    • https://cdn.sqhk.co/zolewiko/ichaDgc/victoria_orenze_brooding_lyrics.pdf
    • http://xaraxag.mypressonline.com/retaxojoz.pdf
    • http://xumupizaxuto.scienceontheweb.net/12492192692.pdf
    • http://ninuxalezopo.getenjoyment.net/pabunijisatelam.pdf
    • http://gexopidikimo.mygamesonline.org/do_navy_officers_get_reenlistment_bonuses.pdf
    • http://wubowobipevoto.mywebcommunity.org/mapa_mundi_paises.pdf
    • https://cdn.sqhk.co/wuwoxegolewa/hbgflRh/my_talking_tom_gold_run_mod_apk.pdf
    • http://mozobadijoba.medianewsonline.com/service_certificate_sample.pdf
    • https://cdn.sqhk.co/dagozuwemep/jbijght/41761214320.pdf
    • http://ninotekega.mygamesonline.org/alain_de_botton_art_as_therapy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_3c6cb547b6ea4b4b8f9d470860259dcf.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_2adc8fc8d61a49559b61e58518a8fc67.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_b865d6eb8d8e4db9beb5f31ddd32613b.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_238e0cbd598a413295c5f59190c9779c.pdf?index=true
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_157c7fe87bc24b56ab3564657a50e99f.pdf?index=true
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_92fbb8607cb34adf85406a6106f53057.pdf?index=true
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_2c80b149e8ab4d859cf2f6b0b4496a85.pdf?index=true
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_d7416ddec7ad47318689ee5d258c5b85.pdf?index=true
    • http://laxuzoto.onlinewebshop.net/bamobimil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010968.bin
97a7a84b508a9f104b7b52a28536fbeaf604c47e1dd869ebb34c927c84f8479c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 5652 bytes
font_01_sfnt_off00011c9f.bin
d2d87aee48ed000cf8a33d9559af5ca06e633396773f677b7ad9c47ecf6ebe74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11052 bytes

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