Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25e43bbf687c4e8…

MALICIOUS

PDF

107.9 KB Created: 2021-05-21 08:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67ce9f1b64018986557c26e7a670aeb SHA-1: b067fc1aeb8925040ebe55089e430bc7b7e899bc SHA-256: c25e43bbf687c4e8409a6861f75efffc00d6fafba878f36a9dcf85127163d5d6
96 Risk Score

Malware Insights

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

The PDF file contains a URL that, when visited, likely leads to a phishing or malware download page. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for phishing or to download a secondary payload.

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://lozipotod.ru/strik?utm_term=intermediate+accounting+kieso+3rd+edition+ppt
    • https://cdn-cms.f-static.net/uploads/4383586/normal_6051442f2711d.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_606d4187bf1f8.pdf
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fed1471e5cf2.pdf
    • https://static.s123-cdn-static.com/uploads/4458389/normal_5fc9e576263ae.pdf
    • https://cdn-cms.f-static.net/uploads/4417138/normal_602a072c798c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba38da39-eaba-4254-8f26-fce2d1f6a733/union_pipefitter_salary_chicago.pdf
    • https://s3.amazonaws.com/pozokimepe/talazajapopat.pdf
    • https://s3.amazonaws.com/tugumeb/unlock_honeywell_touchscreen_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/ebdc2a0a-f779-4a57-aad7-04f1190819ea/lavebufekulifuvogigula.pdf
    • https://s3.amazonaws.com/palevijuj/famupawepefadulukavuv.pdf
    • https://s3.amazonaws.com/teximikamukubo/brazil_visa_application_form_for_indian_citizens.pdf
    • https://uploads.strikinglycdn.com/files/ae5f4604-dfbd-403d-b06c-243670837d92/security_analysis_benjamin_graham_6th_edition.pdf
    • https://s3.amazonaws.com/norozovijalu/6778571727.pdf
    • https://s3.amazonaws.com/matogapibelifiv/78841844715.pdf
    • https://s3.amazonaws.com/nonabafat/27014840461.pdf
    • https://s3.amazonaws.com/juduk/83455783138.pdf
    • https://uploads.strikinglycdn.com/files/e0c2824c-ddee-4543-911f-1a38ca8f3738/conversations_with_god_book_2_review.pdf
    • https://uploads.strikinglycdn.com/files/02aa5e72-b6d0-494c-9664-0a5c3a8ed29d/nonelerujezuw.pdf
    • https://uploads.strikinglycdn.com/files/e31d1607-2e58-4eb7-88b9-efe314617d88/45797801302.pdf
    • https://uploads.strikinglycdn.com/files/308eacb8-b63a-43ff-97f0-1b37d92674cd/discord_server_pfp.pdf
    • https://s3.amazonaws.com/vaxebisapesi/ac_market_apk_android_4._1._2.pdf
    • https://s3.amazonaws.com/salosibejodod/android_os_for_jio_phone.pdf
    • https://s3.amazonaws.com/vuforewebub/snow_white_with_the_red_hair_obi_and_shirayuki.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_off0000eb85.bin
ecd2dca758935a21ca700d4d486a2a4a761c2f4c8ab401d4f4180bb55dda4694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 40888 bytes
font_01_sfnt_off00016920.bin
4c8d3168abd35baffc8e1a72cde8b55e0ccb13b875f49f615e03ae1842f87dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16920 5528 bytes
font_02_sfnt_off00017bd2.bin
d32a15fcd64820b545917ed47fb7b7e3a3e47fcfe7e3d510b537858814b5a9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD2 11008 bytes

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