Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b4c4881fbfb721…

MALICIOUS

PDF

66.7 KB Created: 2020-11-20 06:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec0f842e397b457e98093f52510c2aeb SHA-1: dfdba97ecda1038443e87aa50abb11c5570ce063 SHA-256: d8b4c4881fbfb7215ab70446af98dc0df866d59d51703800af009063c5664089
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains a large number of embedded links, many pointing to redirector infrastructure or potentially malicious content farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of malicious intent, such as phishing or SEO spam. While no scripts were extracted, the sheer volume of suspicious links suggests an attempt to drive traffic to malicious sites.

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://gettraff.ru/aws?utm_term=cowichan+river+fly+fishing+reports In PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/nalura.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/2682511.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/jajoxulabojaso/adulter_carte_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5d8cae-1966-4d24-b70b-47ccad620ffa/92376592008.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/90817480844.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/hydraulic_cartridge_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/a_town_pizza_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/class_12_biology_syllabus_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/gupugagilefutore.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/17089288442.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 5436 bytes
SHA-256: aa482c7b79dd4ad14e540d2b3133f1822c1ea62166933903f23f79a649beb67e
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 10504 bytes
SHA-256: 745156ce674ac8e77f4eaf9f649b83e97efe1f85dde25b9cc2dc59523afccefb

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