Malicious PDF — malware analysis report

Static analysis result for SHA-256 a826a0df39ad5d17…

MALICIOUS

PDF

66.3 KB Created: 2020-11-26 08:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f5d979c1e9863225a711a88cfa4e6095 SHA-1: 2303e58888874f2dad3626c186102ebc90b2d51d SHA-256: a826a0df39ad5d1718bffbf8164ea4456c0650bf0020ad4af0f8675326ee1099
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure referencing 'Webster county jail mississippi' and a high-confidence heuristic for a redirector link. The embedded URL `https://trafffi.ru/strik?utm_term=webster+county+jail+mississippi` is identified as a potential phishing or malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/strik?utm_term=webster+county+jail+mississippi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5f94af1401d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fab1dffcc467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fa7cc3d27fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8cff708bc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fb56d3016d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_5fb323d2b15a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f9e145c1d5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fbdf5346f6cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f9ebec817bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_5fad396abad95.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/221be7a7-041d-4998-b5b4-5814144003af/11612561025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218f8f29-068f-4a1e-8bd5-14cca6b7950b/payslip_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6754117-72a6-4b04-a485-5ac64d439708/paper_1_ib_history_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe5ed32-f995-4a81-9d87-01643f73161b/infamous_festival_of_blood_trophy_guide.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_off0000c5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A1 5412 bytes
SHA-256: 7e3d21dc88dd77a23cabc1356340d0560bf710c4b75d5c160b8137f7ef726f20
font_01_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10856 bytes
SHA-256: ff963f649c32747cbbef02edb4ca3de19d17cc88b93346d714462748373efa0f

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