Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3573be3aa876fa8…

MALICIOUS

PDF

108.2 KB Created: 2020-11-16 19:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ad34278dec4af14037a05c3f8b85aef SHA-1: 1dd2b965ceff9c739767470a2d4f26caf5501c20 SHA-256: a3573be3aa876fa8d028996ecfed04dfac51baf75e5f2c34042e9aba1c5d419a
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 Weebly subdomains, suggesting a link farm or phishing operation. 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 numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=boyd+v+us+case+brief
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fa0f078df149.pdf
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/9902410.pdf
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/222276.pdf
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/4a0be22.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/5338250.pdf
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.pdf
    • https://netaxodesu.weebly.com/uploads/1/3/4/3/134367037/jagevovunub_jilidinakuzuxa_fikunif.pdf
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/vopigelixef.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fa18ea5009f1.pdf
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5fa406ec340cb.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5faa6c1c9275a.pdf
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8d0abcc4efc.pdf
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87418819f0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f89.bin
5c34caa3340bda99e02bec430d52add5f00a93db7d1499d253dc3c692cf6db16
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F89 5032 bytes
font_01_sfnt_off000170bf.bin
200325bcf6dba39a12a2eec2b7893cac9a470fd30858e15b37e2b2436384f8d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x170BF 10812 bytes
font_02_sfnt_off00019598.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x19598 4324 bytes