Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada62cd2274c7f74…

MALICIOUS

PDF

65.5 KB Created: 2020-12-31 16:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 07e6b7b5e78b04c9a075c37c8c7832ec SHA-1: 9880a0da503bdfff5b64b650c874ed41859578f7 SHA-256: ada62cd2274c7f74e7cb1a77a7abf484ee19fa277b0a6d437c196633d69f3709
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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/strik?utm_term=new+slots+games+free+online In PDF document text
    • https://cdn.sqhk.co/wiluxuko/LFibTfn/carson_wentz_college_degree.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/71b064342088.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/muxiduninekuli.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/jesugudilose_nenudasajufoj_wizemozexowom_wuwowudu.pdfIn PDF document text
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/bolipiz.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/ibjif6F/t-_mobile_tv_go.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/2ac23c78-7604-4389-87bb-5a6a2718bcde/99200322187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904fe0c9-cf7c-4cfe-a2a6-40cd24d0b743/nopekenomapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95712796-1575-466b-81a4-8effdd12801c/62198776372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60df247d-16c9-49e5-9f04-a1e6394617a8/sezogeferinakakufupibat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0704c6bd-e548-4f64-a086-49490e422705/christian_marriage_counseling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c1aede-1380-4acc-8538-081e0f14e5a4/71012582572.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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 5148 bytes
SHA-256: cef320471861dd508bb8e83d55650b775a3439e2bee5a5e823a72d0baa6a1d3a
font_01_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 10116 bytes
SHA-256: 1a8d14cad2c3e2f5216bcfd6e6223e359deb25c59f2af800afe59a9292d2e82d

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