Malicious PDF — malware analysis report

Static analysis result for SHA-256 558d6ae3ec177635…

MALICIOUS

PDF

86.5 KB Created: 2021-03-12 18:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 456b9c8b88cd3234147fa9bb413dc663 SHA-1: 7a5c6ea5ee9981fb8c01a94d1cf65f5d29a5c754 SHA-256: 558d6ae3ec177635af1807b97ec5ac6d27435e3ea591c8c4c41d3868a4d4ee3c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The embedded URLs suggest a phishing or malware distribution attempt, likely using the document as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://xezojetit.ru/wix?keyword=solving+systems+of+linear+equations+by+substitution+worksheet+doc PDF link annotation
    • https://cdn.sqhk.co/moviferu/Zvgcezd/23444845289.pdfIn PDF document text
    • http://desokore.medianewsonline.com/ben_hogan_5_lessons_download_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fee0e4119727.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/ehjZ2ib/this_is_anfield_mini_poster.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/3d418b17b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6035b0c51f2d3.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/fakuximu.pdfIn PDF document text
    • http://C:Documents%20and%20SettingsIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_991311144a75439e8f7e2eda03727714.pdf?index=trueIn PDF document text
    • http://sixategajufob.epizy.com/balada_miorita.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_540d865180ec45b399b3b9e97ffa6cfb.pdf?index=trueIn PDF document text
    • http://jokosen.atwebpages.com/how_much_is_tydus_talbott_worth.pdfIn PDF document text
    • http://towawemigegi.epizy.com/37821224237.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_b11b7209f86b4263988093b9b569e5a5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 6124 bytes
SHA-256: 88acf1b3796b55e1f6f8944670828084ef3801f25e9ff6071af15a7d496d2eb3
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 19604 bytes
SHA-256: ccee088c98d3e59b81e851020784b2e1c90cbc3be926454081ec63284da3d700

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