Malicious PDF — malware analysis report

Static analysis result for SHA-256 3729f3257ac8f51d…

MALICIOUS

PDF

82.2 KB Created: 2021-02-01 14:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7f3ba54989dbf9b7cd56b36bda266bf2 SHA-1: 9ef4654d8999ee1467a211ffe87513999d0f474c SHA-256: 3729f3257ac8f51dc34149c1787e97d7d24349298c4f3880f0b089b76b643b95
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO manipulation tactic. While no scripts were extracted, the PDF structure and link analysis strongly indicate a phishing or malicious redirection attempt.

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=poptropica+astro+knights+cheese In PDF document text
    • http://nuveclovet.xyz/marxist_leninist_party_of_canada5tjzc.pdfIn PDF document text
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/615d92.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/864035.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/5787ac2eec15.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/pupal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5ff301db9eee1.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/fibew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5fe5fa1cc568a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_5fd2793dd95ad.pdfIn PDF document text
    • https://jokozoxusatolof.weebly.com/uploads/1/3/1/0/131070378/9062675.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/zutosisilukuwi.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/rimejiguvif/hedwig_s_theme_sheet_music_easy_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/segidetijarujamezegufeza.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/sap_web_dispatcher_7._5_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/68196368459.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/award_show_background_music.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/91155755664.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/voxiwew.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/star_wars_battlefront_ii_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/safety_data_sheet_validity_period.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_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 5228 bytes
SHA-256: f1ffa5bfe8252aa5ec069d21e632639ea1d68c55d8f3196470474ec5564cc5e2
font_01_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 10720 bytes
SHA-256: 790fff5b424aff8176c1a331dbd3d2e9eb0ef8a04de6bbad5c0bbf35bb251f95

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