Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d853f42d1e59f81…

MALICIOUS

PDF

74.8 KB Created: 2021-03-09 16:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 036a75b1dce43804983af9edc83444f9 SHA-1: e6adda1bf24038efaa2fd21e5947829345064d1f SHA-256: 5d853f42d1e59f81101a478c4c3b9dd4d5664b5bf46911a2093b047ef59e134b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=cgi+animation+movies PDF link annotation
    • https://cdn.sqhk.co/pazakazagoz/jcnJjbi/likulavibogulavow.pdfIn PDF document text
    • http://nuzenurego.22web.org/sorabuligarisotosari.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/xabusodafefu-zexezokebo-bituxovezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5fe09be580c22.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/5044593.pdfIn PDF document text
    • http://potusowo.22web.org/cfa_level_1_study_guide.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/2c02164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_5fe9ca5f4a6dd.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/matevij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5fc9a5ca01650.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/jgjcghe/ragim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/mikogu.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_55f04622c4864ebe9a40fec4d65a955e.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_4e712017e2564c7ba593e475a36e0c24.pdf?index=trueIn PDF document text
    • http://junigafef.epizy.com/61051519797.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_c65cf11f3d3b442ab4c77c30fcbd2a3c.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_f6bffbc790d1446cadbb5625fafc3a00.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_637b228c2f194adda1e95e858a074ec7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/tavunarabojaxupemi.pdfIn PDF document text
    • http://repazof.rf.gd/lusadakizogamojiweno.pdfIn PDF document text
    • http://bagineju.epizy.com/immortal_cancer_cells_worksheet_answers.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 4844 bytes
SHA-256: 655a41ae1f044fd747e78fdf26e9eefb2585fac0e03bf84fa21b2866a91d8b70
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10548 bytes
SHA-256: a237b1dfda6b0fe937036531c5fabcc0143cf0e344693ed4cf6f449c1730c36e