Malicious PDF — malware analysis report

Static analysis result for SHA-256 24239f7d99ea3a59…

MALICIOUS

PDF

85.9 KB Created: 2021-02-25 18:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ecca088e3fccab1a577bd84c2005bb05 SHA-1: dda6c28d5b9e7236c7cd77ce94d7343af883ad3a SHA-256: 24239f7d99ea3a590408d020e4425a5490b5cd877eabf34bf43ee75c69d3b804
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://yafferge.ru/123?utm_term=the+miracle+morning+movie+online In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ff62fa58097c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd10bc56d7e8.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/8964362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_600468a78a4ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fec25e41b922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60340e833524e.pdfIn PDF document text
    • http://dobogoj.iblogger.org/99729361891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_602c6909d3cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fcf3e95a264f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_6019d040c4da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fd931b53349a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5ff58253c5a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_60344ece1a98f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jepinebawo/clicker_heroes_transcendence_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/bakra_eid_photo_frame_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/business_ethics_case_study_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 4752 bytes
SHA-256: 156418f62d02cf740873e4b5cb32bf42e63872b49f0e7a97cd9e4e0a7cfa5dcb
font_01_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 10672 bytes
SHA-256: 2889565e1349d2b7018c021223c311ef384fd3484439a7b342196887606abc97
font_02_sfnt_off00013c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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