Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ca43d07f539de4…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 14:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064bb98f71bcde3d599d6f78698e8d45 SHA-1: 53e6cbf13e8fb93ba160d6f3975ed727b73a894e SHA-256: 23ca43d07f539de411bde0dd97ae348819038f47b19e332d98b09acd03d5a7c1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, and numerous other URLs are present within the document, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://botokaw.ru/123?utm_term=esl+asking+questions+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4418590/normal_601781ef73850.pdf
    • http://bilkaita.space/asus_rt-n12_router_setupgdnub.pdf
    • http://reduslimitalia-official.site/crazy_art_cotton_candy_maker_instruc3j0xf.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_601a088f78db1.pdf
    • http://dimax.website/zekizuwulowuvamozijetepuj9vdf4.pdf
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5fcb041cb3175.pdf
    • http://100naturals.fun/3rd_grade_reading_comprehension_worksheets_multiple_choicepwl8n.pdf
    • http://lowabunuzoxa.getenjoyment.net/11797828194.pdf
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ff887bb66870.pdf
    • https://cdn-cms.f-static.net/uploads/4485799/normal_600b48a756942.pdf
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6054660c74a61.pdf
    • https://cdn-cms.f-static.net/uploads/4465539/normal_60484b839efdc.pdf
    • http://warewakeb.sportsontheweb.net/org._apache._poi._xwpf._converter._latest_version.pdf
    • http://comforfemj.fun/slay_the_spire_whalepr2xv.pdf
    • http://reduslim-shopofficial.site/zekixadopiduzixovorerejul1deei.pdf
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5fddc5b1a3549.pdf
    • http://rufawefojag.sportsontheweb.net/article_370_in_gujarati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takurugilij/87587371705.pdf
    • https://s3.amazonaws.com/rujimidujek/aptis_reading_test.pdf
    • https://s3.amazonaws.com/vefagotoje/history_of_the_world_part_1_movie_poster.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/the_night_sky_picture_frame_size.pdf
    • https://s3.amazonaws.com/figidireki/75561446205.pdf
    • http://gixarewujedel.atwebpages.com/the_art_of_choice_sheena_iyengar.pdf
    • http://xadilopavut.myartsonline.com/innateness_theory_of_language_acquisition.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_off0000e9a9.bin
70977b2a26396a3583c3d3d1d4da7115cc61a47324c42ad29fd13362d16faf83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 5544 bytes
font_01_sfnt_off0000fc91.bin
2789540adb2335f27a6e6034a12f21b118f86719ed7deb7b7454948bddb3e318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10908 bytes

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