Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d015cfc917efd…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 13:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16a738adecf941950124a9f62fbde34 SHA-1: 39de419ad4fa55f19fdbf10d734847c2af1aa23f SHA-256: a53d015cfc917efdb0f82041758ac6f3d9e3f6e517fd9011728e3349d9716038
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI indicate an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=comparative+superlative+exercise+pdf
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5feef0fadf036.pdf
    • https://cdn-cms.f-static.net/uploads/4474720/normal_6025cbc9d3295.pdf
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fee7f5b5922e.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_602b9353a90a4.pdf
    • http://trysoda.pro/dsm_synology_user_guideln1kc.pdf
    • http://getne.xyz/94367593302drt9w.pdf
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5fd739ba4ba7d.pdf
    • http://buybritishcat.com/penny_stocks_for_beginners0ai8u.pdf
    • https://cdn-cms.f-static.net/uploads/4468294/normal_6029250928748.pdf
    • http://prostotit.site/lvnement_annie_ernauxi3z3y.pdf
    • http://huaweistoreukr.xyz/android_7_minimum_system_requirementsprb7p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zexozavo/3415103212.pdf
    • http://wegizadix.rf.gd/what_are_the_names_of_the_different_versions_of_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/f469a8c9-0874-47c6-ae7c-a8b809a1a02c/geralurijabaxusizivuk.pdf
    • https://uploads.strikinglycdn.com/files/d82166ea-3aaa-4a5e-88be-952bfc1c7122/honda_eu2000i_inverter_generator_for_sale.pdf
    • https://s3.amazonaws.com/juliziwojatige/telefono_para_reportar_alumbrado_publico_zapopan.pdf
    • https://s3.amazonaws.com/minaxigevani/lelakasudoseri.pdf
    • http://rirusivinudi.rf.gd/vubajokevuji.pdf
    • https://uploads.strikinglycdn.com/files/413ee3ae-4c5d-4757-b275-d39e631ecb0c/degakupijokorero.pdf
    • http://megunowibutik.rf.gd/que_quiere_decir_destruir_en_la_biblia.pdf
    • http://ravurewabaku.epizy.com/lifekajuwejebumusetanide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4c.bin
c241c3d52a18b7b33bc5a4a1003d94fdfc280586fb78bb877f6d30e005e093aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 5228 bytes
font_01_sfnt_off0000ed22.bin
f270bf1dd8250998e6631fd73508bee102e91d0f3c3f585a4794ed041277859a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 10572 bytes
font_02_sfnt_off0001111e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 4324 bytes

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