Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b4ce8bcbbabc6f…

MALICIOUS

PDF

63.5 KB Created: 2020-12-07 00:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf77714ff03cad82e6409f1d8fed1077 SHA-1: d1feb1c1aa7116a1e43cb4a328180fe77ee2c3fd SHA-256: 57b4ce8bcbbabc6f062a17b233cd8be8c57b638a5bfc48bc0b39f50926a8e844
212 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including a known malicious redirector and a link farm, indicating an attempt to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=il-2+tank+crew+missions
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f9ca35713397.pdf
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874ce6d78f1.pdf
    • https://mugabezimezik.weebly.com/uploads/1/3/4/2/134235171/219082.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fa5e9880bdb5.pdf
    • https://cdn-cms.f-static.net/uploads/4481411/normal_5fad705116c9f.pdf
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fca6565c64cb.pdf
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc444b04b171.pdf
    • https://cdn-cms.f-static.net/uploads/4463272/normal_5fa7519862565.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9e2e0acca99.pdf
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/vagetibuwumifen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mizeteb/dilisorilem.pdf
    • https://s3.amazonaws.com/nakuzafol/87205965378.pdf
    • https://uploads.strikinglycdn.com/files/9f45e6bf-5cc1-4cc4-bdc1-793a4579421b/bapodedolijamej.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d947.bin
d07a907351b0730c87e8dbc96d6a1cf1338b5079dbd94c1d78d43e2e6530f258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 5204 bytes

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