Malicious PDF — malware analysis report

Static analysis result for SHA-256 f500b3bd602204bc…

MALICIOUS

PDF

59.3 KB Created: 2020-12-20 23:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9aed5b2571f8ddec23c24eb0009b74c5 SHA-1: 3e4bb91db97849f5c888504d8ea3dcc003ab3df1 SHA-256: f500b3bd602204bc894b13028b855e355a6e2629845ce0430dd3747ba441ee4f
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a high likelihood of malicious intent. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external, potentially malicious, sites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffking.ru/123?utm_term=del+valle+isd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_5faf45e5ef0c9.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/c3043a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5f964d0765b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fc9bf1238ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fb5e1099afde.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/912726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5fcf6b37a1069.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/0b745925-c51a-4365-83bf-406fa489a825/22408252878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb235e7-75ec-4fb3-a329-f29e80697311/34678643489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022f41ad-f704-4107-81b1-3e7d96d84cc7/linupotuzoninivuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/os_quatro_temperamentos_humanos.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/coral_kemuel_musicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edc9060-fd05-4b69-99a6-5c530dfcfe7d/19950688958.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_off0000ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD60 4780 bytes
SHA-256: 0b51a3c7e3ddbae2a57325e4ad107873557fdeb4ecfd9a97a45bc9bdfc8540e5
font_01_sfnt_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 10256 bytes
SHA-256: ea82aae18c5b899d7894d558cc3f4549064587b6c98c67ec50867848a15340b8

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