Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b6b0fceb99d83a…

MALICIOUS

PDF

76.6 KB Created: 2020-12-24 22:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99d77c2b26e1fa4e8b4a3664397a356a SHA-1: d28525f5fdb2039438f5f26df037d04a619cf51f SHA-256: 32b6b0fceb99d83a3c0034fa2acf380836ca81b1b70a06975e3ffccfcace3ea1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=typing+attack+ultimate+typing+games.+type+fighter
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fbfb31092770.pdf
    • https://cdn-cms.f-static.net/uploads/4459025/normal_5fbf5eb78ce15.pdf
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5fe426b0ba982.pdf
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5fc45bdd430ff.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5fb81c0508731.pdf
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fab5df91ad01.pdf
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fa286a1878e6.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fb7060492f36.pdf
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/26961bd22.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fbc12891a538.pdf
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/4492734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/pemavoraximevazure.pdf
    • https://s3.amazonaws.com/xixonu/bugopevixuzebovasekil.pdf
    • https://s3.amazonaws.com/mejawiwomak/crecimiento_bacteriano_microbiologia.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_off0000e987.bin
c97e06019c35af3714e9a8a3af1e5b39c73914d30ba134791f1c91cdce72a83d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 5576 bytes
font_01_sfnt_off0000fc6e.bin
0b092fe4583d53016d28fad02d545702d19a59c7ea1cbc0b99d3a6baf336b47c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 12064 bytes