Malicious PDF — malware analysis report

Static analysis result for SHA-256 b736b79823581c2d…

MALICIOUS

PDF

84.6 KB Created: 2021-05-20 23:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 02ebcd8106b00d3a3891fe5b9db850c8 SHA-1: d5ced9b61cef80dd8a696db96954cb6100302077 SHA-256: b736b79823581c2dbe838574947f137b0312aab99f1261859419bfe57fac0230
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely a malicious domain used for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall context suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=what+chapter+is+aot+season+4+episode+15+in+the+manga PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369501/normal_6012cf015cccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6012834a28f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd6683f45a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_60244e8d93857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_601092a566ef7.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/95fe78ca-78b1-4102-ae87-5693370ead2f/computer_typing_course_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/29874986081.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/89324255393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a1f205-2fc7-48ba-8e4b-44c6d51d3ff6/what_does_the_fall_of_the_house_of_usher_symbolize.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/32467608970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a7839c-ae0a-497f-9dde-9fc86779ddb2/how_to_disassemble_corsair_ironclaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/dikipezupedipenuxewes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2275f47e-f34f-4842-88c6-8b67be6dc745/47676517736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5613956-c041-43d7-b011-9dc1c7aaa1ce/14298667757.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/it_s_ok_tom_rosenthal_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c184e913-0466-4cb6-86f8-0c7b55b01525/65497263940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1472387-381c-4d90-9d7a-813aea81c8cf/how_does_ethnicity_affect_identity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1b7506-7c5c-4adb-b378-fa1d1dbde61d/xupapujuvefafuvewupog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1763cbfc-20eb-4444-81bc-096b881fca94/what_is_alchemy_all_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3618cf-00ad-49b8-9c67-29e00de07cd3/gajupilalerebog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 5524 bytes
SHA-256: b049bbd6f3f6d3ac070bdf6024fb3610a23db427a1176247abd384b1c3ffd93a
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 5732 bytes
SHA-256: ba85089dbb55a25e929a117e5c4a3feaee437b992d8f17d3bacc093acd6032a6
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 10712 bytes
SHA-256: 56a55b2f2de370ab58a87ad720c1807f019cddaf88e2cccbb85ecd1b9f907fa8

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