Malicious PDF — malware analysis report

Static analysis result for SHA-256 954a76f320e580bd…

MALICIOUS

PDF

88.8 KB Created: 2021-03-25 02:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: afe8ced6fe401ee3bde6b34d146520ea SHA-1: fa1d5c971745d2bbf75d7329d0b91622126fe0d5 SHA-256: 954a76f320e580bda4c863a39999a9f99db2aac27826045ae4369869c84fe33c
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7864

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/award?keyword=cluster+computing+and+grid+computing+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/66870746529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_6033cda0219bf.pdfIn PDF document text
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/25c8c6e474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_602464e488b9e.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/2042072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60172b50b1a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c53f5b849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fd1626138584.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/mavusekuvaxuke_sitebuwalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisexizalu.rf.gd/28997138841.pdfIn PDF document text
    • http://libejejizu.epizy.com/96566286389.pdfIn PDF document text
    • http://puwagof.rf.gd/remington_steele_theme_sheet_music.pdfIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_ecafa13ae2ca4316b3422d69c4336a85.pdf?index=trueIn PDF document text
    • http://kejufunekopal.epizy.com/kevogozijixavu.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/87130848111.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_a53e66361b334fc8b84911151d87f7ef.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_56904ea277dc4265ab721771b1e70a4c.pdf?index=trueIn PDF document text
    • http://zopopujeji.rf.gd/26653655963.pdfIn PDF document text
    • http://mutidulofof.epizy.com/5487915258.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_b0cc8ed679e04bd080949430d1165623.pdf?index=trueIn 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_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 5380 bytes
SHA-256: dd05f63a4562d35a5f88e028efa7822da81f5308b1dde0b582b414eacd61eb7d
font_01_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 10968 bytes
SHA-256: 1b6034e8c1f7be14502df1098d14d5f968add9c87465fb93d348cf8f3d1dbc3c

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