Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d64c0561d9f016c…

MALICIOUS

PDF

55.4 KB Created: 2021-03-31 12:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ebcebcc6451b80c06c1e58631a369b37 SHA-1: 5aee8057a6ef9062213076dbd1f699aea30ba329 SHA-256: 1d64c0561d9f016c0b8833049cf03c2d02c8f522c5f3d761f20f0e6836b2a024
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. The primary purpose appears to be directing users to potentially malicious sites, as evidenced by the embedded URLs and the heuristic firings related to link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7781

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://vilenefex.ru/strik?utm_term=sisterhood+is+powerful+pdf+download PDF link annotation
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/4013545.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/66975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_605b046a8f21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_600a5f97c5be7.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/megonal.pdfIn PDF document text
    • https://bakukiteziz.weebly.com/uploads/1/3/4/8/134860946/bepefejenaj_dolaseba_wukezefopuxib_madodovexo.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/punufabevumeb.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/1911713.pdfIn PDF document text
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/dazukebuleravu.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/jalegakokuj-riguvev.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/rutakugiwud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6005bd6c793a5.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/pozoma.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/trastorno_esquizofrenia_paranoide.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/57468027636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6051349da835f.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/5284526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_3984dd810b2b4c5fba7fdf673505a373.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6c6210e0087f4d70b160c28121aebfd2.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_5a5549a174e344a48a920766494186d4.pdf?index=trueIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_c1ecb564a96747bf9d9bb21c043f3085.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 5324 bytes
SHA-256: dfd36f005d63e5a5c4cb35dc5c8c333a0ceb9082454b7383393126ed1677d24d

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