Malicious PDF — malware analysis report

Static analysis result for SHA-256 1931d4153fe70c9f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-19 04:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6846106b4cc7046dc3b5eb770ab7229e SHA-1: 7c40e988525b98d6f9b034a7c4b3aec6cdf7e821 SHA-256: 1931d4153fe70c9f6c714d61c096e568751ba717a9484059984a68e448ec1a13
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "PDF link farm" heuristic, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=jspdf+autotable+draw+cell+example
    • http://gomesuzos.mypressonline.com/lituvipixugagulovuvaw.pdf
    • http://xelowonol.scienceontheweb.net/entrepreneurial_intention.pdf
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/bureluwika.pdf
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/lojulinafarubos_zotajoda.pdf
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/wemoza.pdf
    • http://gagimubu.mywebcommunity.org/who_knows_better_than_me_meaning_in_urdu.pdf
    • https://cdn.sqhk.co/bidogefapo/hjigicz/tutarisudelekukep.pdf
    • https://cdn.sqhk.co/jovuvufoxet/2Djhymu/meaning_of_pacify_in_urdu_and_english.pdf
    • http://movawizaxaxato.mywebcommunity.org/69606320994.pdf
    • https://cdn.sqhk.co/zujubokave/ojactgc/top_ten_soccer_league_in_africa.pdf
    • https://cdn.sqhk.co/mekaxuzoxu/dgpghxE/descargar_wrestling_revolution_3d_mod_wwe_2k19_apk.pdf
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/5310336.pdf
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/putuw.pdf
    • http://gakagebir.mypressonline.com/jetev.pdf
    • http://dekoriribazovax.mywebcommunity.org/calidad_total_y_reingenieria.pdf
    • http://totipuzuforaz.mywebcommunity.org/binomial_ti_84_plus.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/who_is_the_most_evil_norse_god.pdf
    • https://cdn.sqhk.co/genazeres/UijAQyn/41445478361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://damowepoko.myartsonline.com/example_of_argumentative_text.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_cd960fe5519b48448715714466429b6d.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_e1c68e760a4a431e9c6393fb34c8cc95.pdf?index=true
    • http://jisijuvod.myartsonline.com/ximijupuzezivogovo.pdf
    • https://31fd35c7-fba1-4fd7-a6d6-0882eea36c16.filesusr.com/ugd/39a0fd_61ec14a5187c458b9692c50e3ab73998.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_5f1247c8f25c4a519a4762807eca4e00.pdf?index=true
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_6e35df860ff94daeb7948562f39d8026.pdf?index=true
    • http://pojozija.onlinewebshop.net/netgear_ac1600_modem_router_manual.pdf
    • http://fazatela.myartsonline.com/boy_scout_popcorn_order_form.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_off0000f418.bin
6f05c6be3bd0d5b98a93c1b93b2ef67a20395375071a652cc794975c18256f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5592 bytes
font_01_sfnt_off0001071a.bin
7df847d00d027dbf3f785bbb540963491febb22572c750f78f5a83b1c0df8332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 11736 bytes

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