Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f5ca571f1bfd05…

MALICIOUS

PDF

58.4 KB Created: 2020-11-21 22:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8581d8f964566514efd10ab205c3d812 SHA-1: 90584c4689852c73a124275fc9ea21be546063bd SHA-256: 99f5ca571f1bfd05b9502025b0d5c079a3edcdc0f8ff5710887158fcf3eda986
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 URLs, including a critical finding of a link to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external PDF links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/aws?utm_term=despacito+song+music+ringtone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fa18b6c7a68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5f9e42e0da12e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f8b5e14badad.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8735dce7679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5f9a8c883ce88.pdfIn PDF document text
    • https://gituwere.weebly.com/uploads/1/3/0/7/130740556/getuvokoni_vulufexeku_vugaro_juguxixize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fa3c2c8d3531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_5fa22a2b59e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fb013050ddfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5fb2fd1e9951b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f8c0efc83af3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fab6b662b729.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/e6e5e1b6-32f8-4cc0-939c-b0cac5e04408/the_self-taught_programmer_the_definitive_guide_to_programming_professionally_download.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_off0000ab65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB65 5220 bytes
SHA-256: ad7e22496d9acc380f35df59782bba402ad876ba309dea13f777453109fad752
font_01_sfnt_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 9304 bytes
SHA-256: bc1e895edb2cc8a24d539d62c8ff4d027f7c2413778b2bf2f17a2d77571b0210

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