Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90c67ecffe42fed…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 01:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb3daca80f570476d27999aee0a21b6e SHA-1: b1aa76994f883c3dfaefb88c2c45c84f7d8002f7 SHA-256: c90c67ecffe42fed006b3dfe13fbbd385049aad67059bdb3f206ef7c9784fb60
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=angel+hospice+care+palm+springs PDF link annotation
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/54654a1d26a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_603d2b2ccd2f2.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/behringer_xenyx_1204usb_software_download.pdfIn PDF document text
    • http://pebuzuzodofom.22web.org/wumowutarig.pdfIn PDF document text
    • https://vubopedu.weebly.com/uploads/1/3/6/0/136083963/zewefime.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/bovifekubuku_bixoliku.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/38425851528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_605bc1ae24bbc.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/farowug/38258709784.pdfIn PDF document text
    • http://kujinid.rf.gd/what_is_a_psychological_assessment_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/gateway_workbook_answers_a2.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/nunerexafedefimazaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/40073096012.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/equations_with_variables_on_both_sides_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/barium_meal_procedure.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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 5336 bytes
SHA-256: cc4e6fb6c720fa0afe7346bc3c711c39e9569bee2337502f38710385debcbf11
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10432 bytes
SHA-256: 77d17530f07b0ceaf9d2ddb7379f522b96f2b29b2ca2cd87d77a6a4d93043967

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