Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b41b72b2a5c44…

MALICIOUS

PDF

76.3 KB Created: 2021-05-23 03:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d1f122e6f571fab2d8f89c1138ce0f6 SHA-1: 904ef263540f807277dace52afaa69ea51cb6794 SHA-256: 549b41b72b2a5c44e6d8720293b1fbb3aa21ed3f41a187d81beea4a2b10b77ae
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 0.9999

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://gimoguvi.ru/strik?utm_term=covid-19+medical+certificate+format+pdf+download PDF link annotation
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/kotigigamujame.pdfIn PDF document text
    • https://mokonalu.weebly.com/uploads/1/3/0/7/130739423/dujowolavudi.pdfIn PDF document text
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/6936480.pdfIn PDF document text
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/8552e2a1695.pdfIn PDF document text
    • https://zuxijonimobazi.weebly.com/uploads/1/3/5/3/135351106/suvusazoj_notev_sakep_zagabiwe.pdfIn PDF document text
    • https://lalinixew.weebly.com/uploads/1/3/4/2/134265361/nevuxozepu-xegogam-wovasewab-gokadowaxelef.pdfIn PDF document text
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/733567fcf.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/1308167.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/nipipuvajowobiwevi.pdfIn PDF document text
    • https://tokoxiwo.weebly.com/uploads/1/3/4/3/134352544/9490553.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/5615775.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/nazatonudijid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc5d7c9-a9c9-4ba4-a29c-f145d8d11ebb/18721961373.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/percy_jacksons_greek_heroes_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/guzolafawibojizatezovu.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/67964034469.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/olx_pakistan_karachi_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c97bf3e-b4c0-4504-97f8-0d580f51a4c5/55938899576.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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 5420 bytes
SHA-256: 3c35a5e8ecefecc72147a84dd2c155f43f67fc211120294998b6606f87b7b997
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10968 bytes
SHA-256: 79ce628396f39c097cc7ecd6872c4d3aa6ab541fad2c5567e91d536ed8263bdd

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