Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8650e0713d31f7…

MALICIOUS

PDF

77.7 KB Created: 2021-06-03 00:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a93349cad856a6cbd45254ce82a33efc SHA-1: 99e76507be47abbfb80f2a1fd855182321c1e88a SHA-256: 8a8650e0713d31f710191abf8e0c62ee5cf6fd3ee71fbc516f72eed776d6b3a2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=present+simple+tense+worksheet+for+grade+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366969/normal_603479852f732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6047ca5260a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5ffaa19231708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6065256a7a920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3bcb93-1deb-4687-b5d6-ad03a57c3a85/87309018981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea8bc5-aa55-4151-b7bc-c71209e428b0/saserikimefidafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e5f06f-a830-4039-ae30-95f8b25dc4ff/68667836906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df523967-aac5-45e8-ada4-ec49a97ae9b8/the_hobbit_2014_dual_audio_720p_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51cb4be9-2861-434f-ac01-76f6b11db3af/foxpro_wildfire_2_vs_inferno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e7279c-ad8d-4d66-949b-569fb594d20b/42339411998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d81864-edf6-4ce2-ba09-9c9f526fc058/40634746458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b45701-545b-437c-b4ef-f68f827ae346/proper_care_and_feeding_of_husbands_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5252d05a-d5ba-49f3-b8a1-ee10a7d5e85e/the_courage_to_be_disliked_amazon_au.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/how_to_setup_a_sharp_alarm_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703c573e-234f-48d7-89dc-20dcb7635a00/tuletofovuw.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/19121994720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62fa14cd-d0ca-4c31-839d-a08722c9f8f3/how_to_use_a_klein_tools_multimeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad1cd68-2aab-4a0f-897e-5aa2113681de/98289516718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561e05f8-5b33-4b7a-8777-482b0386409b/writing_skills_for_kindergarten_worksheets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 5664 bytes
SHA-256: b84490ba219a199a9b0d5ac07a64f43618fe0c8798488614fabca2c7b4e7db1e
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 11544 bytes
SHA-256: 43c38cb4141a6fc7079b7343f00ff26e511c444535abe18da3c04ebd8babee63

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