Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ec53d779b7d984…

MALICIOUS

PDF

62.8 KB Created: 2021-01-08 17:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06f7e7f46db7ece734660d66d1776cfb SHA-1: ea6bf8189de05334e620b7b933e5a62efd2826e3 SHA-256: 33ec53d779b7d9841f096b14f1d9e0beb376a1365754d07d20e25101f35b1c61
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as a link farm, suggesting a phishing or SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/wb?keyword=minecraft%20dungeons%20om%20nom%20nom%20bugged PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fa9769cae835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8752fda3a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9d5912d918d.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jcjbuTj/71418247792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_5fb92c5349286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407069/normal_5ff7b6fab1664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fb2e7ccdf055.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/3526066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5fad13c30bab2.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/simopugufobifa_zovepij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB9 5452 bytes
SHA-256: 812f925ccb9bbb7579824ab94a4d5d24636b5b74e75e809d443b31a7f3447f00
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 9800 bytes
SHA-256: 38835549f22316df33744fe242b6f7297b0ab9d451ef6d1e418dc160a0c42b14