Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0227a5ce33a7ad7…

MALICIOUS

PDF

76.6 KB Created: 2020-11-21 13:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ada82f74cb07395bac17524a4b9fa35f SHA-1: eae78b5601e2eb5f2236017154a60a592416e708 SHA-256: e0227a5ce33a7ad7779fb19b0a8e15d4bd8b98f404b671af580ab1b7e291aa79
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the presence of malicious links and the PDF structure suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=so+cause+notice+reply+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f9008bfd3971.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/6785798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fb8ab1fb08ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/palevijuj/rimawevamo.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/red_devil_lye_and_clorox.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/93608897924.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/unblocked_games_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/jijalo.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/87325529352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10713d9e-c071-461f-b29f-c327c4b203bb/97720804976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3dc434-55a3-4061-b2fd-05f61aee980d/falimaneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c07011b-30c6-4aec-ae94-72315c1eb6d7/23631379338.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/22372290522.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/89107082990.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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 5132 bytes
SHA-256: ca9cf731ed285b5ab95bbb256ac21c5b8ee527a9f1a1ff2be28b30d4ef150893
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 10584 bytes
SHA-256: 397b11faf8e485f6e82a0146415879415f2628b12ed117029c2bf014aa4c0d0a

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