Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a41937ad5f989fd…

MALICIOUS

PDF

59.9 KB Created: 2020-11-24 04:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 709dbfeddb2631c19698271a951741da SHA-1: d77e7fad0067ea28c0a2c366dcd589f20b45dfb3 SHA-256: 7a41937ad5f989fd1920d289adad68b7e342130b874f178517c61c816d30565a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains links to known malicious redirector infrastructure and a large number of links to other PDFs, suggesting a link farm for SEO manipulation. While no scripts were explicitly extracted, the presence of malicious links and the overall structure indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/123?utm_term=properties+of+circles+unit+6+test+answers In PDF document text
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/4146a.pdfIn PDF document text
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/7540865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_5fa08b2458af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5fa09c83701c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f93153e1eab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5f993ef7c2f28.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/xafaxotaful/diagnostico_anemia_ferropriva.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/baby_photo_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/how_many_tenths_are_there_in_1_whole.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/ad_hoc_reports_using_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/78666571027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda2246c-223e-43f3-b286-0801dbb47c48/vomeko.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/bacterial_and_viral_diseases_in_animals.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1D 5256 bytes
SHA-256: 49ddae46ebb65e4af925f26934ab24be535fb417e13fef842d08a7ce241bb9f7
font_01_sfnt_off0000c021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 10172 bytes
SHA-256: f17de9ea9d1bc5217b03912fa3ca280dcfcfae850f761f6e002e1b445ff4fd01

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