Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8758cc23545e36…

MALICIOUS

PDF

69.5 KB Created: 2021-01-13 18:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 95c2bc60be6ebccab873fa6756c491ce SHA-1: 78a711e28472aad29872db861142a7b35fa2afcc SHA-256: ef8758cc23545e361e15cb273c3dc8bcefdea1f8be99fa69d15f009e51397eb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, including a link farm heuristic, suggests an attempt to redirect users to malicious websites. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the potential for command execution, likely to download and execute further payloads from the identified URLs.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffset.ru/aws?utm_term=free+books+online+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5fa6c21b9a2d5.pdfIn macro / runtime command snippet
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/gafev_jifafebow_samuxitumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f89322b4d081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5fcda9d5c83a7.pdfIn PDF document text
    • https://site-1244934.mozfiles.com/files/1244934/bmw_x3_m40i_performance_upgrades.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/7608678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_5fd12d8b5079d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5fd624622b6c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fb38b46714e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5faebedcb1c07.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/pewibim/46311067646.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/kingsbrook_jewish_hospital_nyc.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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 5068 bytes
SHA-256: a407a2fc3ccaf86c78f648d926b510d64637aebb13679b4d23cf52c4790800ae
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10408 bytes
SHA-256: a229065a9f70c57316541e9ebe482a16fb86e575aea893a5e5fcfc87bf195b18

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