Malicious PDF — malware analysis report

Static analysis result for SHA-256 1303f51aef58f24b…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 02:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec12f1e3b39ebb8a8f3164d86b57e2ef SHA-1: 38db59269b9ffcc8c0011d320450bd540573ed59 SHA-256: 1303f51aef58f24b64d45e0c76a6462136400f6ebf7e2d722e21601e0d623777
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 URI pointing to a suspicious domain, mezovuduw.ru. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'properties of solutions worksheet'. The presence of embedded URLs and the overall detection profile suggest this PDF is designed to deliver a malicious payload or redirect the user to a phishing site.

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://mezovuduw.ru/wix?keyword=properties+of+solutions+worksheet+16.1
    • https://cdn.sqhk.co/zuzudumijamo/gijlAo3/zexeva.pdf
    • https://cdn.sqhk.co/tudifemumopi/BibmjdY/90545565612.pdf
    • http://mpvideo.org/binoloxuribuxigiri3gk48.pdf
    • http://usejus.pro/chaitra_navratri_date_20158jycr.pdf
    • http://oneitstore.pro/pratt_whitney_pt6_maintenance_manual0lo5c.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://study-english-04.space/what_is_the_order_of_the_tintin_bookscjtuw.pdf
    • https://cdn.sqhk.co/bixatavafut/K0jehay/jepudetanirej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_e2dd7eb4e4f648a6a1b4b57cdba78120.pdf?index=true
    • https://s3.amazonaws.com/kosipefojaw/89537409900.pdf
    • https://s3.amazonaws.com/meludav/dofewiwenakewu.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_cd16daad2b06461289dfd95efe99e624.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c47a886e-db77-47d2-a6be-cd0f63965599/html_templates_for_college_website_free_download.pdf
    • https://s3.amazonaws.com/neviwove/26201672924.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_774aa79e727d41f49de44ea272cf177d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5faeed63-dde3-44cf-bc88-20addab8fbb2/wuxutatolojadutogawuva.pdf
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_05ffe62de80f4103b5b578dca70898f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9aa76294-4ece-4c88-9534-a983e94307ad/how_to_write_a_lease_agreement_for_a_room.pdf
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_a00d4d10aa244de5b75a66081b893c01.pdf?index=true
    • 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_off0000f2e7.bin
45dc247cf54d79d15b2090ab524ae1a16ce2220207c6cb6d27ecd10394945734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5172 bytes
font_01_sfnt_off00010499.bin
8be0e4db78d9fa46a9930dd1960776cd0b45467c4876f3e9b918e486fbce3b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10636 bytes

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