Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3dfe2bbc1b7130…

MALICIOUS

PDF

78.8 KB Created: 2021-02-26 21:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e1517fe72f57090a65e4947c0358bc7 SHA-1: b3988e2f83bff9568e8c67b81fc7d9e213b6b7e8 SHA-256: 8e3dfe2bbc1b71309f89f4537a491f442d4b38f23b27e42d015afab7f5922fac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wb?keyword=rigol%20ds1054z%20vs%20siglent%20sds1202x-e PDF link annotation
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/f3fa53f797f5f2.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/pijozo-josipunulijig-basamugozog-mewejaburil.pdfIn PDF document text
    • https://vetetomo.weebly.com/uploads/1/3/4/0/134000119/ed7a2f95699bdc.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/1684811.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/xidubemuz.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/56236f36a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5ff23c74bc85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_60294698d6b0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifazuniduvosi.epizy.com/81114986313.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/how_to_replace_your_thermostat_with_nest.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/omron_blood_pressure_monitor_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/dipapositavogip.pdfIn PDF document text
    • http://walagezumeg.epizy.com/78699083401.pdfIn PDF document text
    • http://tirosonitagaxe.rf.gd/xeganiruzebuwukimaripozij.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/crystal_report_free_for_windows_7.pdfIn PDF document text
    • http://sosirowop.epizy.com/royal_caribbean_cruise_information.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_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 5440 bytes
SHA-256: 56dc991e4fdda19e52d29af5e18536b3757d48255594b15427d85f37331365c9
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10752 bytes
SHA-256: 5dfb792d9712520a17611f68ed794141ba2155ba0aec4db113a58be64a45ae2d

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