Malicious PDF — malware analysis report

Static analysis result for SHA-256 e630d322a924d94d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-12 21:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3e382aca9d176afd845a722f76d8385a SHA-1: 1bb27219c9b0d25818d78edc884383ec3bdf9403 SHA-256: e630d322a924d94d21988da5121012877039b63c3e4cc7e36fd6954a7f03b258
196 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/wix?keyword=gta+4+friends+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425511/normal_5ff2b01124030.pdfIn PDF document text
    • http://dorightschool.com/46897615386kz4gm.pdfIn PDF document text
    • http://loginwithfb.site/absorption_costing_income_statements_ignore7aorc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5fcbd1edd2bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5ff1b129b07c7.pdfIn PDF document text
    • http://profaudit32.ru/access_2016_date_time_format0cef4.pdfIn PDF document text
    • http://f13x.xyz/lupufaqy2pf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5fff375c07723.pdfIn PDF document text
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/07df3a7dacfd3.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/zowibatev/fill_me_up_sheet_music.pdfIn PDF document text
    • http://ramufezumax.rf.gd/articles_worksheets_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/graphing_piecewise_functions_guided_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/zufufiwubijobuzowa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/boynton_beach_police_crime_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/porifera_classification.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_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 5160 bytes
SHA-256: 4249b55277deabc8ec4a78c8ce9425ee66ff2e2c2261c76f541c9991d83be50b
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 10496 bytes
SHA-256: 4c15661f7dc85f51ae32c9eec57fb061ce52bf6a344d3f12bf94922fa6663839