Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e47e01147e742c8…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 02:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f2f09fd0533ae6540e89dfaf1680b9 SHA-1: d339f8191e1d88f2ed715ce5d258a5aafc4a985f SHA-256: 4e47e01147e742c8747b87806be91ee563e8b555cf670af53d1b23ba10ecef96
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to educational content ('chemical bonding worksheet'). The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/wix?keyword=chemical+bonding+worksheet+fill+in+the+blanks
    • http://topshops.website/how_much_does_it_cost_to_start_a_video_production_companygntwn.pdf
    • https://cdn.sqhk.co/gogojelawov/iXnSAM6/rexomimekiru.pdf
    • https://cdn-cms.f-static.net/uploads/4487632/normal_601fd86bef6ae.pdf
    • http://salet.store/81151379432dwv6n.pdf
    • https://cdn.sqhk.co/bupabumo/cNheibS/war_ants_io.pdf
    • https://cdn-cms.f-static.net/uploads/4486192/normal_605bdfe83c719.pdf
    • https://cdn-cms.f-static.net/uploads/4484355/normal_6052cd248fbb0.pdf
    • http://svarka-aurora.online/dekozafoleliy9fsq.pdf
    • http://rbqjkwklnd.xyz/xesolabojajovxm469.pdf
    • http://buylettersonline.com/clarke_bench_grinder_manualbp3yr.pdf
    • http://clebohets.xyz/thule_roof_bars_installationtjyir.pdf
    • https://cdn.sqhk.co/depifozopupe/cuihXjh/huey_dewey_and_louie_halloween.pdf
    • http://azules.ru/baxamalekabiojvar.pdf
    • http://nasporte1.fun/vegan_keto_diet_planiv4cr.pdf
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6055c7d02021c.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fe2f7d6e83b3.pdf
    • http://sreda.city/gnostic_book_of_changesdu16p.pdf
    • https://cdn.sqhk.co/sesekopusoj/hjhdOha/patalekiboneza.pdf
    • http://rostov-mobile-doctor.ru/58927555358do6zf.pdf
    • https://cdn.sqhk.co/nikapeke/bP2OSDx/tiriwowire.pdf
    • http://mojuwimonimo.22web.org/career_quiz_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tinulelor.rf.gd/long_and_short_vowel_sounds_worksheet.pdf
    • http://zonadomafi.rf.gd/1_dm_cuantos_cm_equivale.pdf
    • http://rokodejufoda.rf.gd/zumadavatavuzafu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin
e58699ff34421e6c779dd8d6a95734a6464f935172d983e958dcd12d39179928		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5636 bytes
font_01_sfnt_off00010988.bin
be5f613b728efd9461c0c030bc711e8275353520679d1fed4a2e88e028e22f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10272 bytes
font_02_sfnt_off00012cde.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16092 bytes

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