Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e57de8e2ae9fb0…

MALICIOUS

PDF

75.2 KB Created: 2020-11-18 02:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 694dcb9b0f71c25e7f156e48422e12f4 SHA-1: ed3e6ef1fe1bb4b56c666582bc493e772c03fb0d SHA-256: 18e57de8e2ae9fb0ddb19453dadef0d453a436d3ba623c7ba1004f63b9fbc6d4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to 'https://cctraff.ru/aws?utm_term=frp+bypass+apk+to+sd+card'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to drive traffic to potentially malicious sites. 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
  • 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://cctraff.ru/aws?utm_term=frp+bypass+apk+to+sd+card In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8d2cf35d2eb.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/duzugojakoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fa0dcb3da6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5f9f89bf92756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5f9b023e54115.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/jomevasabejitaren.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/vudezat-fidupodevu-movedowoxije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5faaa7dd72dcc.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/wuporomoj.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/e2add511-eefb-4fd0-b83a-8def0a5e03ff/gimewibapaledonidov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b42a2a8-6000-4aea-9362-557100082a65/58788502726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b205f13b-a8a5-4b9b-9e8f-29e88b1ffd0b/260555273.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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5296 bytes
SHA-256: ea11f2bc45ae0bbe37cce0fffa9fe73ebc722278aad339bb7efd3b2664042158
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11584 bytes
SHA-256: d017dd238948ff183a75ea52c19dc68a3ba1210d52fa548c79ec6ec6bb235341

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