Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ebf40a127964b5…

MALICIOUS

PDF

71.7 KB Created: 2021-05-31 00:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85819f6fc179bc9c0e487f03144e421b SHA-1: acd5c0f8be9c41fd3e132206e3a86d23df838e14 SHA-256: e4ebf40a127964b51352986432404ebf61781cc9175946b211b4cd1bee8a205e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://mezovuduw.ru/123?utm_term=funiculi+funicula+sheet+music+choir+pdf', is presented in a context that mimics search results for sheet music, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and extensive external linking strongly indicate malicious intent, likely involving the execution of embedded JavaScript or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=funiculi+funicula+sheet+music+choir+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401994/normal_60431f108b84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_606b94f6d8aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_6001105605e0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5ff2bdd22d21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6039e9d5cef31.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/sasasovesefufiz_nuwevaw_fipunile.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/likotib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422877/normal_5fe157b8cb28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_602731d374858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_603b68cc76d24.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/domoverajira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464724/normal_5fe5372dacdb6.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/8616efbeb9c2cce.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/34c64fe4-9c6d-4a94-8c02-3627df631b3d/68262747812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e5700b-a3c8-42f4-9d32-082cab8fdddb/rojiwebigivozixadosobev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd490fe-a287-4124-9f64-624807f26d2e/vomofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218d693b-a20a-4b15-8249-b67eca410085/mettler_toledo_ps60_scale_calibration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5551582d-d60c-4336-8193-007874221173/causes_of_war_of_independence_1857_css_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5781bac-edb7-4f0e-bc1a-c2b3729b546d/28869282496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71eac498-28a0-4bce-a0a6-7968b2d9e6c7/monubexam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b74eeb1-f933-4392-8fe4-868c07b5052e/tarakinakeveleki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ea4be0-d4c1-4b96-a5f7-ea5280719f17/vulupinadozuveba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c794a8-0e74-4218-8cb2-6d9760775c69/kubota_l3130_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5576b7f1-485d-44d5-9507-5ac074a54606/dell_precision_t3500_technical_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a730d88-2356-4ae1-ac47-71f3482eed28/how_to_fix_a_mini_dirt_bikes.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 5352 bytes
SHA-256: ad99841afe3d4d285b011504136f059c72f6c744cc0581a6bac5084c8f3ce851
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 10372 bytes
SHA-256: 9100fbf3aedda849a43aecc4f902ba4c37ffca403e41828a655e53208d1c66b2