Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ff871188903b48…

MALICIOUS

PDF

68.6 KB Created: 2021-01-12 00:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e4f8d6de63308ce66e11d2bca805d9a SHA-1: d2e6cf48ab04021fd2964eec9807f6b967b7cbe9 SHA-256: 39ff871188903b48b098889bea32a5f983cc52d3931c84a75345650e0b0afbe6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on services like Weebly and Amazon S3, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://traffset.ru/123?utm_term=virus+shawl+written+pattern+by+connie
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/pesonedopota.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5fb882f1ebf53.pdf
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/5710959.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/likezog-peret.pdf
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9783504e497.pdf
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/9626613.pdf
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5f8cf5254bce3.pdf
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fbbe01dc052a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemefofutomapox/59686221451.pdf
    • https://s3.amazonaws.com/mubemutolewe/vafomopivami.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06f.bin
5a4e083ec2d6fd7be9d3880783febea69823e85f2a4a030dc7ca78bc2c446267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 5320 bytes
font_01_sfnt_off0000e299.bin
205fb0502e26fa7bf5be5b2ed0f1ae3f2629cd4f7e65e2de32870c2080857bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10252 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.