Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cefe6a46acc954…

MALICIOUS

PDF

79.2 KB Created: 2021-02-23 07:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 28ab659577eb6df5dc21afcf199f04b9 SHA-1: c78ae076ae7086db69cb1816a5be3d1ba1d878c5 SHA-256: c6cefe6a46acc954b20028fb4b3b4a4cb860a9e961e524c5bb1f40af5ed4ce98
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The presence of numerous links on disposable hosting suggests a link farm designed to distribute malicious content or phish for information. No scripts were extracted, but the primary attack vector appears to be the malicious URLs embedded within the document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=dyson+v11+animal+cordless+vacuum+cleaner+canada In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_601995b289407.pdfIn PDF document text
    • http://ritixabig.iblogger.org/inventory_report_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_600c15935760c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb68ce72fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5ff389c9b417d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_601f0efdc2eb9.pdfIn PDF document text
    • http://baxemoge.iblogger.org/19809293949.pdfIn PDF document text
    • http://tiktokhd.design/xonuletufaluqg0ie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_6002e73d98ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_603365db0d679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_6024f4ed62ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fefccbbe9825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ff064006e39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuropomap.epizy.com/13922917984.pdfIn PDF document text
    • http://sitejaxikezo.epizy.com/dabazodadegixopisidebo.pdfIn PDF document text
    • http://nanedivelewiwi.epizy.com/facebook_event_cover_template_free.pdfIn PDF document text
    • http://vuzozan.epizy.com/25210829488.pdfIn PDF document text
    • http://pexevogawi.epizy.com/sec_accession_number_format.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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5300 bytes
SHA-256: 7878ffbc12260d46154e367e30e59b0a541a74516b6eeaffdea37ec724fcbcdc
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 13356 bytes
SHA-256: 67b283cb825a495c0b07dae16199e57d675c040af3306f283f7568e577237586

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