Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebdad1c9100b1c1…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 03:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610ebb43c9a06ea76a180a636ba90cca SHA-1: 7de1703d5d28828b6cbc111b6e06122bcd52b9e0 SHA-256: 8ebdad1c9100b1c1afc7863357b1fceac0c40ac4cb8d417d3de45187a2d35a23
196 Risk Score

Malware Insights

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

This PDF document contains numerous external links, suggesting a link farm or redirection scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be part of a multi-stage attack, potentially requiring a password to decrypt a payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/wix?keyword=lg+g5+hidden+menu+unlock
    • https://cdn-cms.f-static.net/uploads/4381544/normal_601c9eb7aa589.pdf
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/wegenudufeg-tagax.pdf
    • http://ig-about.net/bewitoboahzol.pdf
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/3e4285e054b0fb.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_602495f417807.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_6023041d4bdd9.pdf
    • https://cdn-cms.f-static.net/uploads/4401546/normal_60297de1ce83e.pdf
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5ffa7933b274c.pdf
    • https://cdn.sqhk.co/kukisigafumi/KjbGvhe/dupotisojelalazakelixivo.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601a8010bb41b.pdf
    • http://bofinaposo.iblogger.org/ccnp_security_syllabus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lufeneweb.epizy.com/dutufitegowajuku.pdf
    • http://xaxelajifamukas.rf.gd/boboiboy_game_teaser.pdf
    • http://kotidaw.epizy.com/alone_together_full.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e650.bin
cc118621fda91aa9412d241ec9f9e9c5b576db7abe6f4ffb43644c5892c085ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 5000 bytes
font_01_sfnt_off0000f73b.bin
09ba7c1c5151eeaca0922554b28a8051ee83381e0742c406cb9f5f7b88338f96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10532 bytes